Finding the Third Proportional to 618.75 and 618.75

Step by Step Solution

1. Step 1: Write the proportion equation
   618.75 : 618.75 = 618.75 : x
2. Step 2: Convert to fraction form
   618.75/618.75 = 618.75/x
3. Step 3: Cross multiply
   618.75x = 618.75 × 618.75
4. Step 4: Simplify right side
   618.75x = 382,851.56
5. Step 5: Solve for x
   x = 382,851.56/618.75
6. Step 6: Final answer
   x = 618.75