Finding the Fourth Proportional to 140,005.20, 193,121.28 and 89,616.72

Step by Step Solution

1. Step 1: Write the proportion equation
   140,005.20 : 193,121.28 = 89,616.72 : x
2. Step 2: Convert to fraction form
   140,005.20/193,121.28 = 89,616.72/x
3. Step 3: Cross multiply
   140,005.20x = 193,121.28 × 89,616.72
4. Step 4: Simplify right side
   140,005.20x = 17,306,895,675.80
5. Step 5: Solve for x
   x = 17,306,895,675.80/140,005.20
6. Step 6: Final answer
   x = 123,616.09