Finding the Fourth Proportional to 80,411.61, 111,042.72 and 51,780.96

Step by Step Solution

1. Step 1: Write the proportion equation
   80,411.61 : 111,042.72 = 51,780.96 : x
2. Step 2: Convert to fraction form
   80,411.61/111,042.72 = 51,780.96/x
3. Step 3: Cross multiply
   80,411.61x = 111,042.72 × 51,780.96
4. Step 4: Simplify right side
   80,411.61x = 5,749,898,642.61
5. Step 5: Solve for x
   x = 5,749,898,642.61/80,411.61
6. Step 6: Final answer
   x = 71,505.83