Finding the Fourth Proportional to 1,613.76, 2,419.90 and 688.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,613.76 : 2,419.90 = 688.88 : x
2. Step 2: Convert to fraction form
   1,613.76/2,419.90 = 688.88/x
3. Step 3: Cross multiply
   1,613.76x = 2,419.90 × 688.88
4. Step 4: Simplify right side
   1,613.76x = 1,667,020.71
5. Step 5: Solve for x
   x = 1,667,020.71/1,613.76
6. Step 6: Final answer
   x = 1,033.00