Finding the Fourth Proportional to 1,391.41, 1,919.60 and 801.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.41 : 1,919.60 = 801.83 : x
2. Step 2: Convert to fraction form
   1,391.41/1,919.60 = 801.83/x
3. Step 3: Cross multiply
   1,391.41x = 1,919.60 × 801.83
4. Step 4: Simplify right side
   1,391.41x = 1,539,196.66
5. Step 5: Solve for x
   x = 1,539,196.66/1,391.41
6. Step 6: Final answer
   x = 1,106.21