Finding the Fourth Proportional to 12,428.43, 17,150.72 and 6,839.07

Step by Step Solution

1. Step 1: Write the proportion equation
   12,428.43 : 17,150.72 = 6,839.07 : x
2. Step 2: Convert to fraction form
   12,428.43/17,150.72 = 6,839.07/x
3. Step 3: Cross multiply
   12,428.43x = 17,150.72 × 6,839.07
4. Step 4: Simplify right side
   12,428.43x = 117,294,940.44
5. Step 5: Solve for x
   x = 117,294,940.44/12,428.43
6. Step 6: Final answer
   x = 9,437.63