Finding the Fourth Proportional to 1,396.68, 1,926.78 and 865.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.68 : 1,926.78 = 865.32 : x
2. Step 2: Convert to fraction form
   1,396.68/1,926.78 = 865.32/x
3. Step 3: Cross multiply
   1,396.68x = 1,926.78 × 865.32
4. Step 4: Simplify right side
   1,396.68x = 1,667,281.27
5. Step 5: Solve for x
   x = 1,667,281.27/1,396.68
6. Step 6: Final answer
   x = 1,193.75