Finding the Fourth Proportional to 99,061.26, 136,671.24 and 56,589.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,061.26 : 136,671.24 = 56,589.72 : x
2. Step 2: Convert to fraction form
   99,061.26/136,671.24 = 56,589.72/x
3. Step 3: Cross multiply
   99,061.26x = 136,671.24 × 56,589.72
4. Step 4: Simplify right side
   99,061.26x = 7,734,187,203.65
5. Step 5: Solve for x
   x = 7,734,187,203.65/99,061.26
6. Step 6: Final answer
   x = 78,074.79