Finding the Fourth Proportional to 1,396.98, 1,928.21 and 807.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.98 : 1,928.21 = 807.62 : x
2. Step 2: Convert to fraction form
   1,396.98/1,928.21 = 807.62/x
3. Step 3: Cross multiply
   1,396.98x = 1,928.21 × 807.62
4. Step 4: Simplify right side
   1,396.98x = 1,557,247.28
5. Step 5: Solve for x
   x = 1,557,247.28/1,396.98
6. Step 6: Final answer
   x = 1,114.72