Finding the Fourth Proportional to 90,442.89, 135,644.76 and 57,118.41

Step by Step Solution

1. Step 1: Write the proportion equation
   90,442.89 : 135,644.76 = 57,118.41 : x
2. Step 2: Convert to fraction form
   90,442.89/135,644.76 = 57,118.41/x
3. Step 3: Cross multiply
   90,442.89x = 135,644.76 × 57,118.41
4. Step 4: Simplify right side
   90,442.89x = 7,747,813,016.03
5. Step 5: Solve for x
   x = 7,747,813,016.03/90,442.89
6. Step 6: Final answer
   x = 85,665.25