Finding the Fourth Proportional to 113.18, 169.56 and 72.50

Step by Step Solution

1. Step 1: Write the proportion equation
   113.18 : 169.56 = 72.50 : x
2. Step 2: Convert to fraction form
   113.18/169.56 = 72.50/x
3. Step 3: Cross multiply
   113.18x = 169.56 × 72.50
4. Step 4: Simplify right side
   113.18x = 12,293.10
5. Step 5: Solve for x
   x = 12,293.10/113.18
6. Step 6: Final answer
   x = 108.62