Finding the Fourth Proportional to 66,470.38, 91,759.72 and 57,359.50

Step by Step Solution

1. Step 1: Write the proportion equation
   66,470.38 : 91,759.72 = 57,359.50 : x
2. Step 2: Convert to fraction form
   66,470.38/91,759.72 = 57,359.50/x
3. Step 3: Cross multiply
   66,470.38x = 91,759.72 × 57,359.50
4. Step 4: Simplify right side
   66,470.38x = 5,263,291,659.34
5. Step 5: Solve for x
   x = 5,263,291,659.34/66,470.38
6. Step 6: Final answer
   x = 79,182.51