Finding the Fourth Proportional to 2,689.89, 3,706.80 and 1,902.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,689.89 : 3,706.80 = 1,902.57 : x
2. Step 2: Convert to fraction form
   2,689.89/3,706.80 = 1,902.57/x
3. Step 3: Cross multiply
   2,689.89x = 3,706.80 × 1,902.57
4. Step 4: Simplify right side
   2,689.89x = 7,052,446.48
5. Step 5: Solve for x
   x = 7,052,446.48/2,689.89
6. Step 6: Final answer
   x = 2,621.83