Answer :

Sure! Let's arrange the given decimal fractions in ascending order step by step.

### List of Decimal Fractions
The given decimal fractions are:
2.7, 0.55, 0.75, 0.12, 0.302

### Step-by-Step Arrangement in Ascending Order

1. List the decimal fractions:
- 2.7
- 0.55
- 0.75
- 0.12
- 0.302

2. Find the smallest fraction:
- Comparing all the decimals, the smallest one is 0.12.

3. Remove the smallest fraction and find the next smallest:
- Remaining decimals: 2.7, 0.55, 0.75, 0.302
- The next smallest is 0.302.

4. Remove the next smallest and find the next smallest:
- Remaining decimals: 2.7, 0.55, 0.75
- The next smallest is 0.55.

5. Continue the process:
- Remaining decimals: 2.7, 0.75
- The next smallest is 0.75.

6. The last remaining fraction is:
- 2.7

### Arranged in Ascending Order
Putting it all together in ascending order:
- 0.12
- 0.302
- 0.55
- 0.75
- 2.7

### Final Answer
The decimals arranged in ascending order are:
[tex]\[ 0.12, 0.302, 0.55, 0.75, 2.7 \][/tex]

This is the final arrangement of the given decimal fractions in ascending order.