Finding the Third Proportional to 64,900.50 and 139,496.25

Step by Step Solution

1. Step 1: Write the proportion equation
   64,900.50 : 139,496.25 = 139,496.25 : x
2. Step 2: Convert to fraction form
   64,900.50/139,496.25 = 139,496.25/x
3. Step 3: Cross multiply
   64,900.50x = 139,496.25 × 139,496.25
4. Step 4: Simplify right side
   64,900.50x = 19,459,203,764.06
5. Step 5: Solve for x
   x = 19,459,203,764.06/64,900.50
6. Step 6: Final answer
   x = 299,831.34