Finding the Fourth Proportional to 99,500.63, 137,303.93 and 56,480.99

Step by Step Solution

1. Step 1: Write the proportion equation
   99,500.63 : 137,303.93 = 56,480.99 : x
2. Step 2: Convert to fraction form
   99,500.63/137,303.93 = 56,480.99/x
3. Step 3: Cross multiply
   99,500.63x = 137,303.93 × 56,480.99
4. Step 4: Simplify right side
   99,500.63x = 7,755,061,614.89
5. Step 5: Solve for x
   x = 7,755,061,614.89/99,500.63
6. Step 6: Final answer
   x = 77,939.82