Finding the Fourth Proportional to 1,391.26, 1,919.17 and 886.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.26 : 1,919.17 = 886.17 : x
2. Step 2: Convert to fraction form
   1,391.26/1,919.17 = 886.17/x
3. Step 3: Cross multiply
   1,391.26x = 1,919.17 × 886.17
4. Step 4: Simplify right side
   1,391.26x = 1,700,703.87
5. Step 5: Solve for x
   x = 1,700,703.87/1,391.26
6. Step 6: Final answer
   x = 1,222.42