Finding the Fourth Proportional to 1,396.78, 1,927.57 and 767.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.78 : 1,927.57 = 767.37 : x
2. Step 2: Convert to fraction form
   1,396.78/1,927.57 = 767.37/x
3. Step 3: Cross multiply
   1,396.78x = 1,927.57 × 767.37
4. Step 4: Simplify right side
   1,396.78x = 1,479,152.03
5. Step 5: Solve for x
   x = 1,479,152.03/1,396.78
6. Step 6: Final answer
   x = 1,058.97