Finding the Fourth Proportional to 99,510.89, 137,326.34 and 56,487.13

Step by Step Solution

1. Step 1: Write the proportion equation
   99,510.89 : 137,326.34 = 56,487.13 : x
2. Step 2: Convert to fraction form
   99,510.89/137,326.34 = 56,487.13/x
3. Step 3: Cross multiply
   99,510.89x = 137,326.34 × 56,487.13
4. Step 4: Simplify right side
   99,510.89x = 7,757,171,623.20
5. Step 5: Solve for x
   x = 7,757,171,623.20/99,510.89
6. Step 6: Final answer
   x = 77,952.99