Finding the Fourth Proportional to 77,155.31, 106,534.73 and 59,221.91

Step by Step Solution

1. Step 1: Write the proportion equation
   77,155.31 : 106,534.73 = 59,221.91 : x
2. Step 2: Convert to fraction form
   77,155.31/106,534.73 = 59,221.91/x
3. Step 3: Cross multiply
   77,155.31x = 106,534.73 × 59,221.91
4. Step 4: Simplify right side
   77,155.31x = 6,309,189,895.82
5. Step 5: Solve for x
   x = 6,309,189,895.82/77,155.31
6. Step 6: Final answer
   x = 81,772.59