Finding the Fourth Proportional to 1,317.42, 1,976.49 and 667.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,317.42 : 1,976.49 = 667.98 : x
2. Step 2: Convert to fraction form
   1,317.42/1,976.49 = 667.98/x
3. Step 3: Cross multiply
   1,317.42x = 1,976.49 × 667.98
4. Step 4: Simplify right side
   1,317.42x = 1,320,255.79
5. Step 5: Solve for x
   x = 1,320,255.79/1,317.42
6. Step 6: Final answer
   x = 1,002.15