Finding the Third Proportional to 64,860 and 140,790

Step by Step Solution

1. Step 1: Write the proportion equation
   64,860 : 140,790 = 140,790 : x
2. Step 2: Convert to fraction form
   64,860/140,790 = 140,790/x
3. Step 3: Cross multiply
   64,860x = 140,790 × 140,790
4. Step 4: Simplify right side
   64,860x = 19,821,824,100
5. Step 5: Solve for x
   x = 19,821,824,100/64,860
6. Step 6: Final answer
   x = 305,609.38