Finding the Fourth Proportional to 12,191.61, 18,288.12 and 3,427.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,191.61 : 18,288.12 = 3,427.20 : x
2. Step 2: Convert to fraction form
   12,191.61/18,288.12 = 3,427.20/x
3. Step 3: Cross multiply
   12,191.61x = 18,288.12 × 3,427.20
4. Step 4: Simplify right side
   12,191.61x = 62,677,044.86
5. Step 5: Solve for x
   x = 62,677,044.86/12,191.61
6. Step 6: Final answer
   x = 5,141.00