Finding the Fourth Proportional to 89,404.56, 123,385.68 and 57,639.60

Step by Step Solution

1. Step 1: Write the proportion equation
   89,404.56 : 123,385.68 = 57,639.60 : x
2. Step 2: Convert to fraction form
   89,404.56/123,385.68 = 57,639.60/x
3. Step 3: Cross multiply
   89,404.56x = 123,385.68 × 57,639.60
4. Step 4: Simplify right side
   89,404.56x = 7,111,901,240.93
5. Step 5: Solve for x
   x = 7,111,901,240.93/89,404.56
6. Step 6: Final answer
   x = 79,547.41