Finding the Fourth Proportional to 17,139.42, 25,711.83 and 7,278.75

Step by Step Solution

1. Step 1: Write the proportion equation
   17,139.42 : 25,711.83 = 7,278.75 : x
2. Step 2: Convert to fraction form
   17,139.42/25,711.83 = 7,278.75/x
3. Step 3: Cross multiply
   17,139.42x = 25,711.83 × 7,278.75
4. Step 4: Simplify right side
   17,139.42x = 187,149,982.61
5. Step 5: Solve for x
   x = 187,149,982.61/17,139.42
6. Step 6: Final answer
   x = 10,919.27