Finding the Fourth Proportional to 1,397.73, 1,928.94 and 808.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.73 : 1,928.94 = 808.29 : x
2. Step 2: Convert to fraction form
   1,397.73/1,928.94 = 808.29/x
3. Step 3: Cross multiply
   1,397.73x = 1,928.94 × 808.29
4. Step 4: Simplify right side
   1,397.73x = 1,559,142.91
5. Step 5: Solve for x
   x = 1,559,142.91/1,397.73
6. Step 6: Final answer
   x = 1,115.48