Finding the Fourth Proportional to 1,612.38, 2,416.78 and 688.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,612.38 : 2,416.78 = 688.71 : x
2. Step 2: Convert to fraction form
   1,612.38/2,416.78 = 688.71/x
3. Step 3: Cross multiply
   1,612.38x = 2,416.78 × 688.71
4. Step 4: Simplify right side
   1,612.38x = 1,664,458.83
5. Step 5: Solve for x
   x = 1,664,458.83/1,612.38
6. Step 6: Final answer
   x = 1,032.30