Finding the Fourth Proportional to 12,209.69, 18,301.76 and 5,640.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,209.69 : 18,301.76 = 5,640.18 : x
2. Step 2: Convert to fraction form
   12,209.69/18,301.76 = 5,640.18/x
3. Step 3: Cross multiply
   12,209.69x = 18,301.76 × 5,640.18
4. Step 4: Simplify right side
   12,209.69x = 103,225,220.72
5. Step 5: Solve for x
   x = 103,225,220.72/12,209.69
6. Step 6: Final answer
   x = 8,454.37