Finding the Fourth Proportional to 66,501.57, 91,772.18 and 42,628.30

Step by Step Solution

1. Step 1: Write the proportion equation
   66,501.57 : 91,772.18 = 42,628.30 : x
2. Step 2: Convert to fraction form
   66,501.57/91,772.18 = 42,628.30/x
3. Step 3: Cross multiply
   66,501.57x = 91,772.18 × 42,628.30
4. Step 4: Simplify right side
   66,501.57x = 3,912,092,020.69
5. Step 5: Solve for x
   x = 3,912,092,020.69/66,501.57
6. Step 6: Final answer
   x = 58,827.06