Finding the Fourth Proportional to 92.50, 139.07 and 72.25

Step by Step Solution

1. Step 1: Write the proportion equation
   92.50 : 139.07 = 72.25 : x
2. Step 2: Convert to fraction form
   92.50/139.07 = 72.25/x
3. Step 3: Cross multiply
   92.50x = 139.07 × 72.25
4. Step 4: Simplify right side
   92.50x = 10,047.45
5. Step 5: Solve for x
   x = 10,047.45/92.50
6. Step 6: Final answer
   x = 108.62