Finding the Fourth Proportional to 12,191.90, 18,288.52 and 3,426.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,191.90 : 18,288.52 = 3,426.12 : x
2. Step 2: Convert to fraction form
   12,191.90/18,288.52 = 3,426.12/x
3. Step 3: Cross multiply
   12,191.90x = 18,288.52 × 3,426.12
4. Step 4: Simplify right side
   12,191.90x = 62,658,664.14
5. Step 5: Solve for x
   x = 62,658,664.14/12,191.90
6. Step 6: Final answer
   x = 5,139.37