Finding the Fourth Proportional to 76,609.92, 105,773.76 and 56,469.12

Step by Step Solution

1. Step 1: Write the proportion equation
   76,609.92 : 105,773.76 = 56,469.12 : x
2. Step 2: Convert to fraction form
   76,609.92/105,773.76 = 56,469.12/x
3. Step 3: Cross multiply
   76,609.92x = 105,773.76 × 56,469.12
4. Step 4: Simplify right side
   76,609.92x = 5,972,951,146.29
5. Step 5: Solve for x
   x = 5,972,951,146.29/76,609.92
6. Step 6: Final answer
   x = 77,965.77