Finding the Fourth Proportional to 2,185.35, 3,013.68 and 1,687.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.35 : 3,013.68 = 1,687.20 : x
2. Step 2: Convert to fraction form
   2,185.35/3,013.68 = 1,687.20/x
3. Step 3: Cross multiply
   2,185.35x = 3,013.68 × 1,687.20
4. Step 4: Simplify right side
   2,185.35x = 5,084,680.90
5. Step 5: Solve for x
   x = 5,084,680.90/2,185.35
6. Step 6: Final answer
   x = 2,326.71