Finding the Fourth Proportional to 57,411.69, 78,733.80 and 55,016.91

Step by Step Solution

1. Step 1: Write the proportion equation
   57,411.69 : 78,733.80 = 55,016.91 : x
2. Step 2: Convert to fraction form
   57,411.69/78,733.80 = 55,016.91/x
3. Step 3: Cross multiply
   57,411.69x = 78,733.80 × 55,016.91
4. Step 4: Simplify right side
   57,411.69x = 4,331,690,388.56
5. Step 5: Solve for x
   x = 4,331,690,388.56/57,411.69
6. Step 6: Final answer
   x = 75,449.62