Finding the Fourth Proportional to 1,612.56, 2,418.88 and 458.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,612.56 : 2,418.88 = 458.31 : x
2. Step 2: Convert to fraction form
   1,612.56/2,418.88 = 458.31/x
3. Step 3: Cross multiply
   1,612.56x = 2,418.88 × 458.31
4. Step 4: Simplify right side
   1,612.56x = 1,108,596.89
5. Step 5: Solve for x
   x = 1,108,596.89/1,612.56
6. Step 6: Final answer
   x = 687.48