Finding the Fourth Proportional to 103.10, 154.71 and 72.72

Step by Step Solution

1. Step 1: Write the proportion equation
   103.10 : 154.71 = 72.72 : x
2. Step 2: Convert to fraction form
   103.10/154.71 = 72.72/x
3. Step 3: Cross multiply
   103.10x = 154.71 × 72.72
4. Step 4: Simplify right side
   103.10x = 11,250.51
5. Step 5: Solve for x
   x = 11,250.51/103.10
6. Step 6: Final answer
   x = 109.13