Finding the Fourth Proportional to 1,208.70, 1,667.61 and 677.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.70 : 1,667.61 = 677.50 : x
2. Step 2: Convert to fraction form
   1,208.70/1,667.61 = 677.50/x
3. Step 3: Cross multiply
   1,208.70x = 1,667.61 × 677.50
4. Step 4: Simplify right side
   1,208.70x = 1,129,805.78
5. Step 5: Solve for x
   x = 1,129,805.78/1,208.70
6. Step 6: Final answer
   x = 934.73