Finding the Fourth Proportional to 2,074.98, 3,112.18 and 842.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.98 : 3,112.18 = 842.40 : x
2. Step 2: Convert to fraction form
   2,074.98/3,112.18 = 842.40/x
3. Step 3: Cross multiply
   2,074.98x = 3,112.18 × 842.40
4. Step 4: Simplify right side
   2,074.98x = 2,621,700.43
5. Step 5: Solve for x
   x = 2,621,700.43/2,074.98
6. Step 6: Final answer
   x = 1,263.48