Finding the Fourth Proportional to 81,490.80, 112,481.20 and 53,200.72

Step by Step Solution

1. Step 1: Write the proportion equation
   81,490.80 : 112,481.20 = 53,200.72 : x
2. Step 2: Convert to fraction form
   81,490.80/112,481.20 = 53,200.72/x
3. Step 3: Cross multiply
   81,490.80x = 112,481.20 × 53,200.72
4. Step 4: Simplify right side
   81,490.80x = 5,984,080,826.46
5. Step 5: Solve for x
   x = 5,984,080,826.46/81,490.80
6. Step 6: Final answer
   x = 73,432.59