Finding the Fourth Proportional to 2,831.62, 4,218.72 and 2,692.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,831.62 : 4,218.72 = 2,692.20 : x
2. Step 2: Convert to fraction form
   2,831.62/4,218.72 = 2,692.20/x
3. Step 3: Cross multiply
   2,831.62x = 4,218.72 × 2,692.20
4. Step 4: Simplify right side
   2,831.62x = 11,357,637.98
5. Step 5: Solve for x
   x = 11,357,637.98/2,831.62
6. Step 6: Final answer
   x = 4,011.00