Finding the Fourth Proportional to 12,189.10, 16,814.76 and 7,407.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,189.10 : 16,814.76 = 7,407.78 : x
2. Step 2: Convert to fraction form
   12,189.10/16,814.76 = 7,407.78/x
3. Step 3: Cross multiply
   12,189.10x = 16,814.76 × 7,407.78
4. Step 4: Simplify right side
   12,189.10x = 124,560,042.83
5. Step 5: Solve for x
   x = 124,560,042.83/12,189.10
6. Step 6: Final answer
   x = 10,218.97