Finding the Fourth Proportional to 12,156.16, 18,234.30 and 3,391.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,156.16 : 18,234.30 = 3,391.05 : x
2. Step 2: Convert to fraction form
   12,156.16/18,234.30 = 3,391.05/x
3. Step 3: Cross multiply
   12,156.16x = 18,234.30 × 3,391.05
4. Step 4: Simplify right side
   12,156.16x = 61,833,423.02
5. Step 5: Solve for x
   x = 61,833,423.02/12,156.16
6. Step 6: Final answer
   x = 5,086.59