Finding the Fourth Proportional to 9,250.78, 12,764.94 and 5,271.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,250.78 : 12,764.94 = 5,271.40 : x
2. Step 2: Convert to fraction form
   9,250.78/12,764.94 = 5,271.40/x
3. Step 3: Cross multiply
   9,250.78x = 12,764.94 × 5,271.40
4. Step 4: Simplify right side
   9,250.78x = 67,289,104.72
5. Step 5: Solve for x
   x = 67,289,104.72/9,250.78
6. Step 6: Final answer
   x = 7,273.88