Finding the Fourth Proportional to 76,753.56, 105,912.72 and 56,621.61

Step by Step Solution

1. Step 1: Write the proportion equation
   76,753.56 : 105,912.72 = 56,621.61 : x
2. Step 2: Convert to fraction form
   76,753.56/105,912.72 = 56,621.61/x
3. Step 3: Cross multiply
   76,753.56x = 105,912.72 × 56,621.61
4. Step 4: Simplify right side
   76,753.56x = 5,996,948,725.88
5. Step 5: Solve for x
   x = 5,996,948,725.88/76,753.56
6. Step 6: Final answer
   x = 78,132.52