Finding the Fourth Proportional to 60,415.52, 83,339.87 and 56,139.08

Step by Step Solution

1. Step 1: Write the proportion equation
   60,415.52 : 83,339.87 = 56,139.08 : x
2. Step 2: Convert to fraction form
   60,415.52/83,339.87 = 56,139.08/x
3. Step 3: Cross multiply
   60,415.52x = 83,339.87 × 56,139.08
4. Step 4: Simplify right side
   60,415.52x = 4,678,622,931.72
5. Step 5: Solve for x
   x = 4,678,622,931.72/60,415.52
6. Step 6: Final answer
   x = 77,440.75