Finding the Fourth Proportional to 2,689.45, 3,711.42 and 1,478.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,689.45 : 3,711.42 = 1,478.15 : x
2. Step 2: Convert to fraction form
   2,689.45/3,711.42 = 1,478.15/x
3. Step 3: Cross multiply
   2,689.45x = 3,711.42 × 1,478.15
4. Step 4: Simplify right side
   2,689.45x = 5,486,041.02
5. Step 5: Solve for x
   x = 5,486,041.02/2,689.45
6. Step 6: Final answer
   x = 2,039.83