Finding the Fourth Proportional to 81,731.58, 112,789.67 and 45,921.57

Step by Step Solution

1. Step 1: Write the proportion equation
   81,731.58 : 112,789.67 = 45,921.57 : x
2. Step 2: Convert to fraction form
   81,731.58/112,789.67 = 45,921.57/x
3. Step 3: Cross multiply
   81,731.58x = 112,789.67 × 45,921.57
4. Step 4: Simplify right side
   81,731.58x = 5,179,478,726.18
5. Step 5: Solve for x
   x = 5,179,478,726.18/81,731.58
6. Step 6: Final answer
   x = 63,371.82