Finding the Fourth Proportional to 12,221.69, 18,329.59 and 5,641.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,221.69 : 18,329.59 = 5,641.55 : x
2. Step 2: Convert to fraction form
   12,221.69/18,329.59 = 5,641.55/x
3. Step 3: Cross multiply
   12,221.69x = 18,329.59 × 5,641.55
4. Step 4: Simplify right side
   12,221.69x = 103,407,282.60
5. Step 5: Solve for x
   x = 103,407,282.60/12,221.69
6. Step 6: Final answer
   x = 8,460.97