Finding the Fourth Proportional to 12,156.62, 18,234.72 and 3,391.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,156.62 : 18,234.72 = 3,391.61 : x
2. Step 2: Convert to fraction form
   12,156.62/18,234.72 = 3,391.61/x
3. Step 3: Cross multiply
   12,156.62x = 18,234.72 × 3,391.61
4. Step 4: Simplify right side
   12,156.62x = 61,844,967.53
5. Step 5: Solve for x
   x = 61,844,967.53/12,156.62
6. Step 6: Final answer
   x = 5,087.35