Finding the Fourth Proportional to 17,139.48, 25,711.93 and 7,278.81

Step by Step Solution

1. Step 1: Write the proportion equation
   17,139.48 : 25,711.93 = 7,278.81 : x
2. Step 2: Convert to fraction form
   17,139.48/25,711.93 = 7,278.81/x
3. Step 3: Cross multiply
   17,139.48x = 25,711.93 × 7,278.81
4. Step 4: Simplify right side
   17,139.48x = 187,152,253.20
5. Step 5: Solve for x
   x = 187,152,253.20/17,139.48
6. Step 6: Final answer
   x = 10,919.37