Finding the Fourth Proportional to 1,638.18, 2,456.51 and 713.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.18 : 2,456.51 = 713.27 : x
2. Step 2: Convert to fraction form
   1,638.18/2,456.51 = 713.27/x
3. Step 3: Cross multiply
   1,638.18x = 2,456.51 × 713.27
4. Step 4: Simplify right side
   1,638.18x = 1,752,154.89
5. Step 5: Solve for x
   x = 1,752,154.89/1,638.18
6. Step 6: Final answer
   x = 1,069.57