Finding the Fourth Proportional to 9,278.72, 12,805.28 and 5,087.24

Step by Step Solution

1. Step 1: Write the proportion equation
   9,278.72 : 12,805.28 = 5,087.24 : x
2. Step 2: Convert to fraction form
   9,278.72/12,805.28 = 5,087.24/x
3. Step 3: Cross multiply
   9,278.72x = 12,805.28 × 5,087.24
4. Step 4: Simplify right side
   9,278.72x = 65,143,532.63
5. Step 5: Solve for x
   x = 65,143,532.63/9,278.72
6. Step 6: Final answer
   x = 7,020.75