Finding the Fourth Proportional to 1,612.79, 2,419.43 and 688.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,612.79 : 2,419.43 = 688.35 : x
2. Step 2: Convert to fraction form
   1,612.79/2,419.43 = 688.35/x
3. Step 3: Cross multiply
   1,612.79x = 2,419.43 × 688.35
4. Step 4: Simplify right side
   1,612.79x = 1,665,411.20
5. Step 5: Solve for x
   x = 1,665,411.20/1,612.79
6. Step 6: Final answer
   x = 1,032.63