Finding the Third Proportional to 603.56 and 1,261.55

Step by Step Solution

1. Step 1: Write the proportion equation
   603.56 : 1,261.55 = 1,261.55 : x
2. Step 2: Convert to fraction form
   603.56/1,261.55 = 1,261.55/x
3. Step 3: Cross multiply
   603.56x = 1,261.55 × 1,261.55
4. Step 4: Simplify right side
   603.56x = 1,591,500.52
5. Step 5: Solve for x
   x = 1,591,500.52/603.56
6. Step 6: Final answer
   x = 2,636.84