Finding the Fourth Proportional to 81,789.30, 112,869.71 and 45,978.99

Step by Step Solution

1. Step 1: Write the proportion equation
   81,789.30 : 112,869.71 = 45,978.99 : x
2. Step 2: Convert to fraction form
   81,789.30/112,869.71 = 45,978.99/x
3. Step 3: Cross multiply
   81,789.30x = 112,869.71 × 45,978.99
4. Step 4: Simplify right side
   81,789.30x = 5,189,635,037.50
5. Step 5: Solve for x
   x = 5,189,635,037.50/81,789.30
6. Step 6: Final answer
   x = 63,451.27