Finding the Fourth Proportional to 123,689.96, 170,616.20 and 109,303.61

Step by Step Solution

1. Step 1: Write the proportion equation
   123,689.96 : 170,616.20 = 109,303.61 : x
2. Step 2: Convert to fraction form
   123,689.96/170,616.20 = 109,303.61/x
3. Step 3: Cross multiply
   123,689.96x = 170,616.20 × 109,303.61
4. Step 4: Simplify right side
   123,689.96x = 18,648,966,464.50
5. Step 5: Solve for x
   x = 18,648,966,464.50/123,689.96
6. Step 6: Final answer
   x = 150,771.88