Finding the Fourth Proportional to 2,012.28, 3,019.50 and 842.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.28 : 3,019.50 = 842.10 : x
2. Step 2: Convert to fraction form
   2,012.28/3,019.50 = 842.10/x
3. Step 3: Cross multiply
   2,012.28x = 3,019.50 × 842.10
4. Step 4: Simplify right side
   2,012.28x = 2,542,720.95
5. Step 5: Solve for x
   x = 2,542,720.95/2,012.28
6. Step 6: Final answer
   x = 1,263.60