Finding the Fourth Proportional to 12,088.20, 18,139.56 and 4,296.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,088.20 : 18,139.56 = 4,296.42 : x
2. Step 2: Convert to fraction form
   12,088.20/18,139.56 = 4,296.42/x
3. Step 3: Cross multiply
   12,088.20x = 18,139.56 × 4,296.42
4. Step 4: Simplify right side
   12,088.20x = 77,935,168.38
5. Step 5: Solve for x
   x = 77,935,168.38/12,088.20
6. Step 6: Final answer
   x = 6,447.21