Finding the Fourth Proportional to 3,678.89, 5,071.39 and 2,685.29

Step by Step Solution

1. Step 1: Write the proportion equation
   3,678.89 : 5,071.39 = 2,685.29 : x
2. Step 2: Convert to fraction form
   3,678.89/5,071.39 = 2,685.29/x
3. Step 3: Cross multiply
   3,678.89x = 5,071.39 × 2,685.29
4. Step 4: Simplify right side
   3,678.89x = 13,618,139.43
5. Step 5: Solve for x
   x = 13,618,139.43/3,678.89
6. Step 6: Final answer
   x = 3,701.70