Finding the Fourth Proportional to 89,689.95, 123,718.16 and 57,431.55

Step by Step Solution

1. Step 1: Write the proportion equation
   89,689.95 : 123,718.16 = 57,431.55 : x
2. Step 2: Convert to fraction form
   89,689.95/123,718.16 = 57,431.55/x
3. Step 3: Cross multiply
   89,689.95x = 123,718.16 × 57,431.55
4. Step 4: Simplify right side
   89,689.95x = 7,105,325,404.79
5. Step 5: Solve for x
   x = 7,105,325,404.79/89,689.95
6. Step 6: Final answer
   x = 79,220.98