Finding the Fourth Proportional to 1,613.48, 2,419.16 and 688.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,613.48 : 2,419.16 = 688.43 : x
2. Step 2: Convert to fraction form
   1,613.48/2,419.16 = 688.43/x
3. Step 3: Cross multiply
   1,613.48x = 2,419.16 × 688.43
4. Step 4: Simplify right side
   1,613.48x = 1,665,424.92
5. Step 5: Solve for x
   x = 1,665,424.92/1,613.48
6. Step 6: Final answer
   x = 1,032.20