Finding the Fourth Proportional to 12,191.63, 18,288.45 and 3,426.62

Step by Step Solution

1. Step 1: Write the proportion equation
   12,191.63 : 18,288.45 = 3,426.62 : x
2. Step 2: Convert to fraction form
   12,191.63/18,288.45 = 3,426.62/x
3. Step 3: Cross multiply
   12,191.63x = 18,288.45 × 3,426.62
4. Step 4: Simplify right side
   12,191.63x = 62,667,477.10
5. Step 5: Solve for x
   x = 62,667,477.10/12,191.63
6. Step 6: Final answer
   x = 5,140.21