Finding the Fourth Proportional to 12,579.31, 17,361.71 and 8,108.65

Step by Step Solution

1. Step 1: Write the proportion equation
   12,579.31 : 17,361.71 = 8,108.65 : x
2. Step 2: Convert to fraction form
   12,579.31/17,361.71 = 8,108.65/x
3. Step 3: Cross multiply
   12,579.31x = 17,361.71 × 8,108.65
4. Step 4: Simplify right side
   12,579.31x = 140,780,029.79
5. Step 5: Solve for x
   x = 140,780,029.79/12,579.31
6. Step 6: Final answer
   x = 11,191.40