Finding the Fourth Proportional to 123,081.96, 169,909.80 and 72,087.60

Step by Step Solution

1. Step 1: Write the proportion equation
   123,081.96 : 169,909.80 = 72,087.60 : x
2. Step 2: Convert to fraction form
   123,081.96/169,909.80 = 72,087.60/x
3. Step 3: Cross multiply
   123,081.96x = 169,909.80 × 72,087.60
4. Step 4: Simplify right side
   123,081.96x = 12,248,389,698.48
5. Step 5: Solve for x
   x = 12,248,389,698.48/123,081.96
6. Step 6: Final answer
   x = 99,514.09