Finding the Fourth Proportional to 2,105.87, 2,906.52 and 1,397.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.87 : 2,906.52 = 1,397.75 : x
2. Step 2: Convert to fraction form
   2,105.87/2,906.52 = 1,397.75/x
3. Step 3: Cross multiply
   2,105.87x = 2,906.52 × 1,397.75
4. Step 4: Simplify right side
   2,105.87x = 4,062,573.80
5. Step 5: Solve for x
   x = 4,062,573.80/2,105.87
6. Step 6: Final answer
   x = 1,929.17