Finding the Fourth Proportional to 12,209.49, 18,320.90 and 5,636.34

Step by Step Solution

1. Step 1: Write the proportion equation
   12,209.49 : 18,320.90 = 5,636.34 : x
2. Step 2: Convert to fraction form
   12,209.49/18,320.90 = 5,636.34/x
3. Step 3: Cross multiply
   12,209.49x = 18,320.90 × 5,636.34
4. Step 4: Simplify right side
   12,209.49x = 103,262,793.32
5. Step 5: Solve for x
   x = 103,262,793.32/12,209.49
6. Step 6: Final answer
   x = 8,457.58