Finding the Fourth Proportional to 1,638.26, 2,456.86 and 713.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.26 : 2,456.86 = 713.55 : x
2. Step 2: Convert to fraction form
   1,638.26/2,456.86 = 713.55/x
3. Step 3: Cross multiply
   1,638.26x = 2,456.86 × 713.55
4. Step 4: Simplify right side
   1,638.26x = 1,753,081.46
5. Step 5: Solve for x
   x = 1,753,081.46/1,638.26
6. Step 6: Final answer
   x = 1,070.09