Finding the Fourth Proportional to 12,213.02, 16,856.16 and 7,499.90

Step by Step Solution

1. Step 1: Write the proportion equation
   12,213.02 : 16,856.16 = 7,499.90 : x
2. Step 2: Convert to fraction form
   12,213.02/16,856.16 = 7,499.90/x
3. Step 3: Cross multiply
   12,213.02x = 16,856.16 × 7,499.90
4. Step 4: Simplify right side
   12,213.02x = 126,419,514.38
5. Step 5: Solve for x
   x = 126,419,514.38/12,213.02
6. Step 6: Final answer
   x = 10,351.21