Finding the Fourth Proportional to 12,404.50, 17,118.21 and 6,815.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,404.50 : 17,118.21 = 6,815.50 : x
2. Step 2: Convert to fraction form
   12,404.50/17,118.21 = 6,815.50/x
3. Step 3: Cross multiply
   12,404.50x = 17,118.21 × 6,815.50
4. Step 4: Simplify right side
   12,404.50x = 116,669,160.26
5. Step 5: Solve for x
   x = 116,669,160.26/12,404.50
6. Step 6: Final answer
   x = 9,405.39