Finding the Fourth Proportional to 2,074.52, 3,112.22 and 687.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.52 : 3,112.22 = 687.78 : x
2. Step 2: Convert to fraction form
   2,074.52/3,112.22 = 687.78/x
3. Step 3: Cross multiply
   2,074.52x = 3,112.22 × 687.78
4. Step 4: Simplify right side
   2,074.52x = 2,140,522.67
5. Step 5: Solve for x
   x = 2,140,522.67/2,074.52
6. Step 6: Final answer
   x = 1,031.82