Finding the Fourth Proportional to 89,078.76, 122,869.62 and 57,287.88

Step by Step Solution

1. Step 1: Write the proportion equation
   89,078.76 : 122,869.62 = 57,287.88 : x
2. Step 2: Convert to fraction form
   89,078.76/122,869.62 = 57,287.88/x
3. Step 3: Cross multiply
   89,078.76x = 122,869.62 × 57,287.88
4. Step 4: Simplify right side
   89,078.76x = 7,038,940,046.21
5. Step 5: Solve for x
   x = 7,038,940,046.21/89,078.76
6. Step 6: Final answer
   x = 79,019.29