Finding the Fourth Proportional to 128,499.52, 192,593.76 and 54,472

Step by Step Solution

1. Step 1: Write the proportion equation
   128,499.52 : 192,593.76 = 54,472 : x
2. Step 2: Convert to fraction form
   128,499.52/192,593.76 = 54,472/x
3. Step 3: Cross multiply
   128,499.52x = 192,593.76 × 54,472
4. Step 4: Simplify right side
   128,499.52x = 10,490,967,294.72
5. Step 5: Solve for x
   x = 10,490,967,294.72/128,499.52
6. Step 6: Final answer
   x = 81,642.07