Finding the Third Proportional to 618.75 and 1,150.31

Step by Step Solution

1. Step 1: Write the proportion equation
   618.75 : 1,150.31 = 1,150.31 : x
2. Step 2: Convert to fraction form
   618.75/1,150.31 = 1,150.31/x
3. Step 3: Cross multiply
   618.75x = 1,150.31 × 1,150.31
4. Step 4: Simplify right side
   618.75x = 1,323,218.85
5. Step 5: Solve for x
   x = 1,323,218.85/618.75
6. Step 6: Final answer
   x = 2,138.54