Finding the Fourth Proportional to 83,520.28, 115,179.72 and 66,580.72

Step by Step Solution

1. Step 1: Write the proportion equation
   83,520.28 : 115,179.72 = 66,580.72 : x
2. Step 2: Convert to fraction form
   83,520.28/115,179.72 = 66,580.72/x
3. Step 3: Cross multiply
   83,520.28x = 115,179.72 × 66,580.72
4. Step 4: Simplify right side
   83,520.28x = 7,668,748,687.00
5. Step 5: Solve for x
   x = 7,668,748,687.00/83,520.28
6. Step 6: Final answer
   x = 91,819.00