Finding the Fourth Proportional to 12,179.31, 18,270.86 and 4,389.95

Step by Step Solution

1. Step 1: Write the proportion equation
   12,179.31 : 18,270.86 = 4,389.95 : x
2. Step 2: Convert to fraction form
   12,179.31/18,270.86 = 4,389.95/x
3. Step 3: Cross multiply
   12,179.31x = 18,270.86 × 4,389.95
4. Step 4: Simplify right side
   12,179.31x = 80,208,048.55
5. Step 5: Solve for x
   x = 80,208,048.55/12,179.31
6. Step 6: Final answer
   x = 6,585.60