Finding the Fourth Proportional to 123,878.46, 171,023.20 and 81,560

Step by Step Solution

1. Step 1: Write the proportion equation
   123,878.46 : 171,023.20 = 81,560 : x
2. Step 2: Convert to fraction form
   123,878.46/171,023.20 = 81,560/x
3. Step 3: Cross multiply
   123,878.46x = 171,023.20 × 81,560
4. Step 4: Simplify right side
   123,878.46x = 13,948,652,192
5. Step 5: Solve for x
   x = 13,948,652,192/123,878.46
6. Step 6: Final answer
   x = 112,599.50