Finding the Fourth Proportional to 2,685.15, 3,706.89 and 2,086.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,685.15 : 3,706.89 = 2,086.30 : x
2. Step 2: Convert to fraction form
   2,685.15/3,706.89 = 2,086.30/x
3. Step 3: Cross multiply
   2,685.15x = 3,706.89 × 2,086.30
4. Step 4: Simplify right side
   2,685.15x = 7,733,681.42
5. Step 5: Solve for x
   x = 7,733,681.42/2,685.15
6. Step 6: Final answer
   x = 2,880.17