Finding the Fourth Proportional to 16,680.63, 23,018.61 and 9,126.78

Step by Step Solution

1. Step 1: Write the proportion equation
   16,680.63 : 23,018.61 = 9,126.78 : x
2. Step 2: Convert to fraction form
   16,680.63/23,018.61 = 9,126.78/x
3. Step 3: Cross multiply
   16,680.63x = 23,018.61 × 9,126.78
4. Step 4: Simplify right side
   16,680.63x = 210,085,789.38
5. Step 5: Solve for x
   x = 210,085,789.38/16,680.63
6. Step 6: Final answer
   x = 12,594.60