Finding the Fourth Proportional to 9,250.72, 12,768.36 and 5,711.90

Step by Step Solution

1. Step 1: Write the proportion equation
   9,250.72 : 12,768.36 = 5,711.90 : x
2. Step 2: Convert to fraction form
   9,250.72/12,768.36 = 5,711.90/x
3. Step 3: Cross multiply
   9,250.72x = 12,768.36 × 5,711.90
4. Step 4: Simplify right side
   9,250.72x = 72,931,595.48
5. Step 5: Solve for x
   x = 72,931,595.48/9,250.72
6. Step 6: Final answer
   x = 7,883.88