Finding the Fourth Proportional to 89,580.42, 123,488.46 and 57,311.55

Step by Step Solution

1. Step 1: Write the proportion equation
   89,580.42 : 123,488.46 = 57,311.55 : x
2. Step 2: Convert to fraction form
   89,580.42/123,488.46 = 57,311.55/x
3. Step 3: Cross multiply
   89,580.42x = 123,488.46 × 57,311.55
4. Step 4: Simplify right side
   89,580.42x = 7,077,315,049.71
5. Step 5: Solve for x
   x = 7,077,315,049.71/89,580.42
6. Step 6: Final answer
   x = 79,005.16