Finding the Fourth Proportional to 123,879.91, 171,025.10 and 81,561.46

Step by Step Solution

1. Step 1: Write the proportion equation
   123,879.91 : 171,025.10 = 81,561.46 : x
2. Step 2: Convert to fraction form
   123,879.91/171,025.10 = 81,561.46/x
3. Step 3: Cross multiply
   123,879.91x = 171,025.10 × 81,561.46
4. Step 4: Simplify right side
   123,879.91x = 13,949,056,852.65
5. Step 5: Solve for x
   x = 13,949,056,852.65/123,879.91
6. Step 6: Final answer
   x = 112,601.44