Finding the Fourth Proportional to 1,168.98, 1,613.52 and 921.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,168.98 : 1,613.52 = 921.43 : x
2. Step 2: Convert to fraction form
   1,168.98/1,613.52 = 921.43/x
3. Step 3: Cross multiply
   1,168.98x = 1,613.52 × 921.43
4. Step 4: Simplify right side
   1,168.98x = 1,486,738.67
5. Step 5: Solve for x
   x = 1,486,738.67/1,168.98
6. Step 6: Final answer
   x = 1,271.82