Finding the Fourth Proportional to 1,396.67, 1,927.43 and 767.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.67 : 1,927.43 = 767.21 : x
2. Step 2: Convert to fraction form
   1,396.67/1,927.43 = 767.21/x
3. Step 3: Cross multiply
   1,396.67x = 1,927.43 × 767.21
4. Step 4: Simplify right side
   1,396.67x = 1,478,733.93
5. Step 5: Solve for x
   x = 1,478,733.93/1,396.67
6. Step 6: Final answer
   x = 1,058.76