Finding the Fourth Proportional to 101.24, 139.71 and 72.17

Step by Step Solution

1. Step 1: Write the proportion equation
   101.24 : 139.71 = 72.17 : x
2. Step 2: Convert to fraction form
   101.24/139.71 = 72.17/x
3. Step 3: Cross multiply
   101.24x = 139.71 × 72.17
4. Step 4: Simplify right side
   101.24x = 10,082.87
5. Step 5: Solve for x
   x = 10,082.87/101.24
6. Step 6: Final answer
   x = 99.59