Finding the Fourth Proportional to 100.92, 139.32 and 71.94

Step by Step Solution

1. Step 1: Write the proportion equation
   100.92 : 139.32 = 71.94 : x
2. Step 2: Convert to fraction form
   100.92/139.32 = 71.94/x
3. Step 3: Cross multiply
   100.92x = 139.32 × 71.94
4. Step 4: Simplify right side
   100.92x = 10,022.68
5. Step 5: Solve for x
   x = 10,022.68/100.92
6. Step 6: Final answer
   x = 99.31