Finding the Fourth Proportional to 76,504.80, 105,516.72 and 56,350.56

Step by Step Solution

1. Step 1: Write the proportion equation
   76,504.80 : 105,516.72 = 56,350.56 : x
2. Step 2: Convert to fraction form
   76,504.80/105,516.72 = 56,350.56/x
3. Step 3: Cross multiply
   76,504.80x = 105,516.72 × 56,350.56
4. Step 4: Simplify right side
   76,504.80x = 5,945,926,261.36
5. Step 5: Solve for x
   x = 5,945,926,261.36/76,504.80
6. Step 6: Final answer
   x = 77,719.65