Finding the Fourth Proportional to 2,237.20, 3,086.42 and 1,292.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,237.20 : 3,086.42 = 1,292.80 : x
2. Step 2: Convert to fraction form
   2,237.20/3,086.42 = 1,292.80/x
3. Step 3: Cross multiply
   2,237.20x = 3,086.42 × 1,292.80
4. Step 4: Simplify right side
   2,237.20x = 3,990,123.78
5. Step 5: Solve for x
   x = 3,990,123.78/2,237.20
6. Step 6: Final answer
   x = 1,783.53