Finding the Fourth Proportional to 1,397.32, 1,928.18 and 807.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.32 : 1,928.18 = 807.89 : x
2. Step 2: Convert to fraction form
   1,397.32/1,928.18 = 807.89/x
3. Step 3: Cross multiply
   1,397.32x = 1,928.18 × 807.89
4. Step 4: Simplify right side
   1,397.32x = 1,557,747.70
5. Step 5: Solve for x
   x = 1,557,747.70/1,397.32
6. Step 6: Final answer
   x = 1,114.81