Finding the Fourth Proportional to 1,687.78, 2,519.59 and 1,676.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,687.78 : 2,519.59 = 1,676.14 : x
2. Step 2: Convert to fraction form
   1,687.78/2,519.59 = 1,676.14/x
3. Step 3: Cross multiply
   1,687.78x = 2,519.59 × 1,676.14
4. Step 4: Simplify right side
   1,687.78x = 4,223,185.58
5. Step 5: Solve for x
   x = 4,223,185.58/1,687.78
6. Step 6: Final answer
   x = 2,502.21