Finding the Fourth Proportional to 1,613.87, 2,418.52 and 688.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,613.87 : 2,418.52 = 688.49 : x
2. Step 2: Convert to fraction form
   1,613.87/2,418.52 = 688.49/x
3. Step 3: Cross multiply
   1,613.87x = 2,418.52 × 688.49
4. Step 4: Simplify right side
   1,613.87x = 1,665,126.83
5. Step 5: Solve for x
   x = 1,665,126.83/1,613.87
6. Step 6: Final answer
   x = 1,031.76