Finding the Fourth Proportional to 12,387.90, 17,080.56 and 9,019.92

Step by Step Solution

1. Step 1: Write the proportion equation
   12,387.90 : 17,080.56 = 9,019.92 : x
2. Step 2: Convert to fraction form
   12,387.90/17,080.56 = 9,019.92/x
3. Step 3: Cross multiply
   12,387.90x = 17,080.56 × 9,019.92
4. Step 4: Simplify right side
   12,387.90x = 154,065,284.76
5. Step 5: Solve for x
   x = 154,065,284.76/12,387.90
6. Step 6: Final answer
   x = 12,436.76