Finding the Fourth Proportional to 123,105.81, 169,885.98 and 66,517.20

Step by Step Solution

1. Step 1: Write the proportion equation
   123,105.81 : 169,885.98 = 66,517.20 : x
2. Step 2: Convert to fraction form
   123,105.81/169,885.98 = 66,517.20/x
3. Step 3: Cross multiply
   123,105.81x = 169,885.98 × 66,517.20
4. Step 4: Simplify right side
   123,105.81x = 11,300,339,708.86
5. Step 5: Solve for x
   x = 11,300,339,708.86/123,105.81
6. Step 6: Final answer
   x = 91,793.72