Finding the Fourth Proportional to 1,391.52, 1,920.07 and 801.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.52 : 1,920.07 = 801.94 : x
2. Step 2: Convert to fraction form
   1,391.52/1,920.07 = 801.94/x
3. Step 3: Cross multiply
   1,391.52x = 1,920.07 × 801.94
4. Step 4: Simplify right side
   1,391.52x = 1,539,776.93
5. Step 5: Solve for x
   x = 1,539,776.93/1,391.52
6. Step 6: Final answer
   x = 1,106.55