Finding the Fourth Proportional to 12,974.10, 17,908.29 and 7,939.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,974.10 : 17,908.29 = 7,939.86 : x
2. Step 2: Convert to fraction form
   12,974.10/17,908.29 = 7,939.86/x
3. Step 3: Cross multiply
   12,974.10x = 17,908.29 × 7,939.86
4. Step 4: Simplify right side
   12,974.10x = 142,189,315.44
5. Step 5: Solve for x
   x = 142,189,315.44/12,974.10
6. Step 6: Final answer
   x = 10,959.47