Finding the Fourth Proportional to 81,456.04, 112,407.78 and 53,108.20

Step by Step Solution

1. Step 1: Write the proportion equation
   81,456.04 : 112,407.78 = 53,108.20 : x
2. Step 2: Convert to fraction form
   81,456.04/112,407.78 = 53,108.20/x
3. Step 3: Cross multiply
   81,456.04x = 112,407.78 × 53,108.20
4. Step 4: Simplify right side
   81,456.04x = 5,969,774,861.80
5. Step 5: Solve for x
   x = 5,969,774,861.80/81,456.04
6. Step 6: Final answer
   x = 73,288.30