Finding the Fourth Proportional to 1,391.77, 1,919.86 and 1,250.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.77 : 1,919.86 = 1,250.83 : x
2. Step 2: Convert to fraction form
   1,391.77/1,919.86 = 1,250.83/x
3. Step 3: Cross multiply
   1,391.77x = 1,919.86 × 1,250.83
4. Step 4: Simplify right side
   1,391.77x = 2,401,418.48
5. Step 5: Solve for x
   x = 2,401,418.48/1,391.77
6. Step 6: Final answer
   x = 1,725.44