Finding the Fourth Proportional to 2,074.57, 3,112.04 and 687.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.57 : 3,112.04 = 687.91 : x
2. Step 2: Convert to fraction form
   2,074.57/3,112.04 = 687.91/x
3. Step 3: Cross multiply
   2,074.57x = 3,112.04 × 687.91
4. Step 4: Simplify right side
   2,074.57x = 2,140,803.44
5. Step 5: Solve for x
   x = 2,140,803.44/2,074.57
6. Step 6: Final answer
   x = 1,031.93