Finding the Third Proportional to 64,617.75 and 139,613.25

Step by Step Solution

1. Step 1: Write the proportion equation
   64,617.75 : 139,613.25 = 139,613.25 : x
2. Step 2: Convert to fraction form
   64,617.75/139,613.25 = 139,613.25/x
3. Step 3: Cross multiply
   64,617.75x = 139,613.25 × 139,613.25
4. Step 4: Simplify right side
   64,617.75x = 19,491,859,575.56
5. Step 5: Solve for x
   x = 19,491,859,575.56/64,617.75
6. Step 6: Final answer
   x = 301,648.69