Finding the Fourth Proportional to 99,510.36, 137,317.32 and 56,490.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,510.36 : 137,317.32 = 56,490.72 : x
2. Step 2: Convert to fraction form
   99,510.36/137,317.32 = 56,490.72/x
3. Step 3: Cross multiply
   99,510.36x = 137,317.32 × 56,490.72
4. Step 4: Simplify right side
   99,510.36x = 7,757,154,275.27
5. Step 5: Solve for x
   x = 7,757,154,275.27/99,510.36
6. Step 6: Final answer
   x = 77,953.23