Finding the Fourth Proportional to 8,216.90, 12,340.20 and 7,196.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,216.90 : 12,340.20 = 7,196.30 : x
2. Step 2: Convert to fraction form
   8,216.90/12,340.20 = 7,196.30/x
3. Step 3: Cross multiply
   8,216.90x = 12,340.20 × 7,196.30
4. Step 4: Simplify right side
   8,216.90x = 88,803,781.26
5. Step 5: Solve for x
   x = 88,803,781.26/8,216.90
6. Step 6: Final answer
   x = 10,807.46