Finding the Fourth Proportional to 1,396.77, 1,927.55 and 807.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.77 : 1,927.55 = 807.31 : x
2. Step 2: Convert to fraction form
   1,396.77/1,927.55 = 807.31/x
3. Step 3: Cross multiply
   1,396.77x = 1,927.55 × 807.31
4. Step 4: Simplify right side
   1,396.77x = 1,556,130.39
5. Step 5: Solve for x
   x = 1,556,130.39/1,396.77
6. Step 6: Final answer
   x = 1,114.09