Finding the Fourth Proportional to 1,208.32, 1,667.42 and 677.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.32 : 1,667.42 = 677.20 : x
2. Step 2: Convert to fraction form
   1,208.32/1,667.42 = 677.20/x
3. Step 3: Cross multiply
   1,208.32x = 1,667.42 × 677.20
4. Step 4: Simplify right side
   1,208.32x = 1,129,176.82
5. Step 5: Solve for x
   x = 1,129,176.82/1,208.32
6. Step 6: Final answer
   x = 934.50