Finding the Fourth Proportional to 99,500.36, 137,303.52 and 56,480.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,500.36 : 137,303.52 = 56,480.72 : x
2. Step 2: Convert to fraction form
   99,500.36/137,303.52 = 56,480.72/x
3. Step 3: Cross multiply
   99,500.36x = 137,303.52 × 56,480.72
4. Step 4: Simplify right side
   99,500.36x = 7,755,001,668.13
5. Step 5: Solve for x
   x = 7,755,001,668.13/99,500.36
6. Step 6: Final answer
   x = 77,939.43