Finding the Fourth Proportional to 128,468.20, 192,443.10 and 89,069.80

Step by Step Solution

1. Step 1: Write the proportion equation
   128,468.20 : 192,443.10 = 89,069.80 : x
2. Step 2: Convert to fraction form
   128,468.20/192,443.10 = 89,069.80/x
3. Step 3: Cross multiply
   128,468.20x = 192,443.10 × 89,069.80
4. Step 4: Simplify right side
   128,468.20x = 17,140,868,428.38
5. Step 5: Solve for x
   x = 17,140,868,428.38/128,468.20
6. Step 6: Final answer
   x = 133,424.99