Finding the Fourth Proportional to 100.72, 139.08 and 75.04

Step by Step Solution

1. Step 1: Write the proportion equation
   100.72 : 139.08 = 75.04 : x
2. Step 2: Convert to fraction form
   100.72/139.08 = 75.04/x
3. Step 3: Cross multiply
   100.72x = 139.08 × 75.04
4. Step 4: Simplify right side
   100.72x = 10,436.56
5. Step 5: Solve for x
   x = 10,436.56/100.72
6. Step 6: Final answer
   x = 103.62