Finding the Fourth Proportional to 2,073.64, 3,111.04 and 687.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,073.64 : 3,111.04 = 687.10 : x
2. Step 2: Convert to fraction form
   2,073.64/3,111.04 = 687.10/x
3. Step 3: Cross multiply
   2,073.64x = 3,111.04 × 687.10
4. Step 4: Simplify right side
   2,073.64x = 2,137,595.58
5. Step 5: Solve for x
   x = 2,137,595.58/2,073.64
6. Step 6: Final answer
   x = 1,030.84