Finding the Fourth Proportional to 81,789.31, 112,865.96 and 45,978.56

Step by Step Solution

1. Step 1: Write the proportion equation
   81,789.31 : 112,865.96 = 45,978.56 : x
2. Step 2: Convert to fraction form
   81,789.31/112,865.96 = 45,978.56/x
3. Step 3: Cross multiply
   81,789.31x = 112,865.96 × 45,978.56
4. Step 4: Simplify right side
   81,789.31x = 5,189,413,519.60
5. Step 5: Solve for x
   x = 5,189,413,519.60/81,789.31
6. Step 6: Final answer
   x = 63,448.56