Finding the Fourth Proportional to 5,291.20, 7,936.72 and 1,288.62

Step by Step Solution

1. Step 1: Write the proportion equation
   5,291.20 : 7,936.72 = 1,288.62 : x
2. Step 2: Convert to fraction form
   5,291.20/7,936.72 = 1,288.62/x
3. Step 3: Cross multiply
   5,291.20x = 7,936.72 × 1,288.62
4. Step 4: Simplify right side
   5,291.20x = 10,227,404.61
5. Step 5: Solve for x
   x = 10,227,404.61/5,291.20
6. Step 6: Final answer
   x = 1,932.91