Finding the Fourth Proportional to 12,209.86, 18,314.59 and 3,889.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,209.86 : 18,314.59 = 3,889.80 : x
2. Step 2: Convert to fraction form
   12,209.86/18,314.59 = 3,889.80/x
3. Step 3: Cross multiply
   12,209.86x = 18,314.59 × 3,889.80
4. Step 4: Simplify right side
   12,209.86x = 71,240,092.18
5. Step 5: Solve for x
   x = 71,240,092.18/12,209.86
6. Step 6: Final answer
   x = 5,834.64