Finding the Fourth Proportional to 76,480.94, 105,514.20 and 56,385.59

Step by Step Solution

1. Step 1: Write the proportion equation
   76,480.94 : 105,514.20 = 56,385.59 : x
2. Step 2: Convert to fraction form
   76,480.94/105,514.20 = 56,385.59/x
3. Step 3: Cross multiply
   76,480.94x = 105,514.20 × 56,385.59
4. Step 4: Simplify right side
   76,480.94x = 5,949,480,420.38
5. Step 5: Solve for x
   x = 5,949,480,420.38/76,480.94
6. Step 6: Final answer
   x = 77,790.37