Finding the Fourth Proportional to 89,693.91, 123,644.70 and 57,423.90

Step by Step Solution

1. Step 1: Write the proportion equation
   89,693.91 : 123,644.70 = 57,423.90 : x
2. Step 2: Convert to fraction form
   89,693.91/123,644.70 = 57,423.90/x
3. Step 3: Cross multiply
   89,693.91x = 123,644.70 × 57,423.90
4. Step 4: Simplify right side
   89,693.91x = 7,100,160,888.33
5. Step 5: Solve for x
   x = 7,100,160,888.33/89,693.91
6. Step 6: Final answer
   x = 79,159.90