Finding the Fourth Proportional to 99,642.56, 137,501.82 and 56,616.44

Step by Step Solution

1. Step 1: Write the proportion equation
   99,642.56 : 137,501.82 = 56,616.44 : x
2. Step 2: Convert to fraction form
   99,642.56/137,501.82 = 56,616.44/x
3. Step 3: Cross multiply
   99,642.56x = 137,501.82 × 56,616.44
4. Step 4: Simplify right side
   99,642.56x = 7,784,862,854.41
5. Step 5: Solve for x
   x = 7,784,862,854.41/99,642.56
6. Step 6: Final answer
   x = 78,127.89