Finding the Fourth Proportional to 76,660.52, 105,762.05 and 56,565.30

Step by Step Solution

1. Step 1: Write the proportion equation
   76,660.52 : 105,762.05 = 56,565.30 : x
2. Step 2: Convert to fraction form
   76,660.52/105,762.05 = 56,565.30/x
3. Step 3: Cross multiply
   76,660.52x = 105,762.05 × 56,565.30
4. Step 4: Simplify right side
   76,660.52x = 5,982,462,086.87
5. Step 5: Solve for x
   x = 5,982,462,086.87/76,660.52
6. Step 6: Final answer
   x = 78,038.37