Finding the Fourth Proportional to 1,396.69, 1,927.46 and 767.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.69 : 1,927.46 = 767.21 : x
2. Step 2: Convert to fraction form
   1,396.69/1,927.46 = 767.21/x
3. Step 3: Cross multiply
   1,396.69x = 1,927.46 × 767.21
4. Step 4: Simplify right side
   1,396.69x = 1,478,758.87
5. Step 5: Solve for x
   x = 1,478,758.87/1,396.69
6. Step 6: Final answer
   x = 1,058.76