Finding the Fourth Proportional to 1,638.72, 2,456.55 and 598.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.72 : 2,456.55 = 598.47 : x
2. Step 2: Convert to fraction form
   1,638.72/2,456.55 = 598.47/x
3. Step 3: Cross multiply
   1,638.72x = 2,456.55 × 598.47
4. Step 4: Simplify right side
   1,638.72x = 1,470,171.48
5. Step 5: Solve for x
   x = 1,470,171.48/1,638.72
6. Step 6: Final answer
   x = 897.15