Finding the Fourth Proportional to 17,878.43, 24,672.42 and 9,920.78

Step by Step Solution

1. Step 1: Write the proportion equation
   17,878.43 : 24,672.42 = 9,920.78 : x
2. Step 2: Convert to fraction form
   17,878.43/24,672.42 = 9,920.78/x
3. Step 3: Cross multiply
   17,878.43x = 24,672.42 × 9,920.78
4. Step 4: Simplify right side
   17,878.43x = 244,769,650.89
5. Step 5: Solve for x
   x = 244,769,650.89/17,878.43
6. Step 6: Final answer
   x = 13,690.78