Finding the Fourth Proportional to 12,662.16, 18,991.05 and 3,426

Step by Step Solution

1. Step 1: Write the proportion equation
   12,662.16 : 18,991.05 = 3,426 : x
2. Step 2: Convert to fraction form
   12,662.16/18,991.05 = 3,426/x
3. Step 3: Cross multiply
   12,662.16x = 18,991.05 × 3,426
4. Step 4: Simplify right side
   12,662.16x = 65,063,337.30
5. Step 5: Solve for x
   x = 65,063,337.30/12,662.16
6. Step 6: Final answer
   x = 5,138.41