Finding the Fourth Proportional to 2,074.41, 3,111.70 and 687.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.41 : 3,111.70 = 687.86 : x
2. Step 2: Convert to fraction form
   2,074.41/3,111.70 = 687.86/x
3. Step 3: Cross multiply
   2,074.41x = 3,111.70 × 687.86
4. Step 4: Simplify right side
   2,074.41x = 2,140,409.64
5. Step 5: Solve for x
   x = 2,140,409.64/2,074.41
6. Step 6: Final answer
   x = 1,031.82