Finding the Fourth Proportional to 89,726.32, 123,792.60 and 57,916.36

Step by Step Solution

1. Step 1: Write the proportion equation
   89,726.32 : 123,792.60 = 57,916.36 : x
2. Step 2: Convert to fraction form
   89,726.32/123,792.60 = 57,916.36/x
3. Step 3: Cross multiply
   89,726.32x = 123,792.60 × 57,916.36
4. Step 4: Simplify right side
   89,726.32x = 7,169,616,786.94
5. Step 5: Solve for x
   x = 7,169,616,786.94/89,726.32
6. Step 6: Final answer
   x = 79,905.39