Finding the Fourth Proportional to 2,086.35, 3,136.20 and 1,680

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.35 : 3,136.20 = 1,680 : x
2. Step 2: Convert to fraction form
   2,086.35/3,136.20 = 1,680/x
3. Step 3: Cross multiply
   2,086.35x = 3,136.20 × 1,680
4. Step 4: Simplify right side
   2,086.35x = 5,268,816
5. Step 5: Solve for x
   x = 5,268,816/2,086.35
6. Step 6: Final answer
   x = 2,525.37