Finding the Fourth Proportional to 1,397.09, 1,928.27 and 807.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.09 : 1,928.27 = 807.55 : x
2. Step 2: Convert to fraction form
   1,397.09/1,928.27 = 807.55/x
3. Step 3: Cross multiply
   1,397.09x = 1,928.27 × 807.55
4. Step 4: Simplify right side
   1,397.09x = 1,557,171.64
5. Step 5: Solve for x
   x = 1,557,171.64/1,397.09
6. Step 6: Final answer
   x = 1,114.58