Finding the Fourth Proportional to 99,530.72, 137,328.54 and 56,500.64

Step by Step Solution

1. Step 1: Write the proportion equation
   99,530.72 : 137,328.54 = 56,500.64 : x
2. Step 2: Convert to fraction form
   99,530.72/137,328.54 = 56,500.64/x
3. Step 3: Cross multiply
   99,530.72x = 137,328.54 × 56,500.64
4. Step 4: Simplify right side
   99,530.72x = 7,759,150,400.27
5. Step 5: Solve for x
   x = 7,759,150,400.27/99,530.72
6. Step 6: Final answer
   x = 77,957.34