Finding the Fourth Proportional to 12,171.32, 18,254.23 and 5,591.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,171.32 : 18,254.23 = 5,591.18 : x
2. Step 2: Convert to fraction form
   12,171.32/18,254.23 = 5,591.18/x
3. Step 3: Cross multiply
   12,171.32x = 18,254.23 × 5,591.18
4. Step 4: Simplify right side
   12,171.32x = 102,062,685.69
5. Step 5: Solve for x
   x = 102,062,685.69/12,171.32
6. Step 6: Final answer
   x = 8,385.51