Finding the Fourth Proportional to 2,105.87, 2,906.15 and 1,266.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.87 : 2,906.15 = 1,266.91 : x
2. Step 2: Convert to fraction form
   2,105.87/2,906.15 = 1,266.91/x
3. Step 3: Cross multiply
   2,105.87x = 2,906.15 × 1,266.91
4. Step 4: Simplify right side
   2,105.87x = 3,681,816.90
5. Step 5: Solve for x
   x = 3,681,816.90/2,105.87
6. Step 6: Final answer
   x = 1,748.36