Finding the Fourth Proportional to 128,443.88, 192,721.17 and 53,578.77

Step by Step Solution

1. Step 1: Write the proportion equation
   128,443.88 : 192,721.17 = 53,578.77 : x
2. Step 2: Convert to fraction form
   128,443.88/192,721.17 = 53,578.77/x
3. Step 3: Cross multiply
   128,443.88x = 192,721.17 × 53,578.77
4. Step 4: Simplify right side
   128,443.88x = 10,325,762,719.78
5. Step 5: Solve for x
   x = 10,325,762,719.78/128,443.88
6. Step 6: Final answer
   x = 80,391.24