Finding the Fourth Proportional to 2,011.88, 3,018.66 and 842.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,011.88 : 3,018.66 = 842.10 : x
2. Step 2: Convert to fraction form
   2,011.88/3,018.66 = 842.10/x
3. Step 3: Cross multiply
   2,011.88x = 3,018.66 × 842.10
4. Step 4: Simplify right side
   2,011.88x = 2,542,013.59
5. Step 5: Solve for x
   x = 2,542,013.59/2,011.88
6. Step 6: Final answer
   x = 1,263.50