Finding the Fourth Proportional to 99,128.72, 148,697.40 and 39,157.04

Step by Step Solution

1. Step 1: Write the proportion equation
   99,128.72 : 148,697.40 = 39,157.04 : x
2. Step 2: Convert to fraction form
   99,128.72/148,697.40 = 39,157.04/x
3. Step 3: Cross multiply
   99,128.72x = 148,697.40 × 39,157.04
4. Step 4: Simplify right side
   99,128.72x = 5,822,550,039.70
5. Step 5: Solve for x
   x = 5,822,550,039.70/99,128.72
6. Step 6: Final answer
   x = 58,737.27