Finding the Fourth Proportional to 1,638.02, 2,456.33 and 760.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.02 : 2,456.33 = 760.39 : x
2. Step 2: Convert to fraction form
   1,638.02/2,456.33 = 760.39/x
3. Step 3: Cross multiply
   1,638.02x = 2,456.33 × 760.39
4. Step 4: Simplify right side
   1,638.02x = 1,867,758.83
5. Step 5: Solve for x
   x = 1,867,758.83/1,638.02
6. Step 6: Final answer
   x = 1,140.25