Finding the Fourth Proportional to 1,396.80, 1,927.57 and 807.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.80 : 1,927.57 = 807.33 : x
2. Step 2: Convert to fraction form
   1,396.80/1,927.57 = 807.33/x
3. Step 3: Cross multiply
   1,396.80x = 1,927.57 × 807.33
4. Step 4: Simplify right side
   1,396.80x = 1,556,185.09
5. Step 5: Solve for x
   x = 1,556,185.09/1,396.80
6. Step 6: Final answer
   x = 1,114.11