Finding the Fourth Proportional to 89,487.40, 123,438.18 and 64,370.92

Step by Step Solution

1. Step 1: Write the proportion equation
   89,487.40 : 123,438.18 = 64,370.92 : x
2. Step 2: Convert to fraction form
   89,487.40/123,438.18 = 64,370.92/x
3. Step 3: Cross multiply
   89,487.40x = 123,438.18 × 64,370.92
4. Step 4: Simplify right side
   89,487.40x = 7,945,829,209.73
5. Step 5: Solve for x
   x = 7,945,829,209.73/89,487.40
6. Step 6: Final answer
   x = 88,792.72