Finding the Fourth Proportional to 12,663.16, 18,992.55 and 3,427

Step by Step Solution

1. Step 1: Write the proportion equation
   12,663.16 : 18,992.55 = 3,427 : x
2. Step 2: Convert to fraction form
   12,663.16/18,992.55 = 3,427/x
3. Step 3: Cross multiply
   12,663.16x = 18,992.55 × 3,427
4. Step 4: Simplify right side
   12,663.16x = 65,087,468.85
5. Step 5: Solve for x
   x = 65,087,468.85/12,663.16
6. Step 6: Final answer
   x = 5,139.91