Finding the Fourth Proportional to 91,057.55, 125,679.53 and 59,171.09

Step by Step Solution

1. Step 1: Write the proportion equation
   91,057.55 : 125,679.53 = 59,171.09 : x
2. Step 2: Convert to fraction form
   91,057.55/125,679.53 = 59,171.09/x
3. Step 3: Cross multiply
   91,057.55x = 125,679.53 × 59,171.09
4. Step 4: Simplify right side
   91,057.55x = 7,436,594,300.32
5. Step 5: Solve for x
   x = 7,436,594,300.32/91,057.55
6. Step 6: Final answer
   x = 81,669.17