Finding the Fourth Proportional to 81,731.61, 112,789.72 and 45,921.60

Step by Step Solution

1. Step 1: Write the proportion equation
   81,731.61 : 112,789.72 = 45,921.60 : x
2. Step 2: Convert to fraction form
   81,731.61/112,789.72 = 45,921.60/x
3. Step 3: Cross multiply
   81,731.61x = 112,789.72 × 45,921.60
4. Step 4: Simplify right side
   81,731.61x = 5,179,484,291.15
5. Step 5: Solve for x
   x = 5,179,484,291.15/81,731.61
6. Step 6: Final answer
   x = 63,371.86