Finding the Third Proportional to 67,054.50 and 139,564.69

Step by Step Solution

1. Step 1: Write the proportion equation
   67,054.50 : 139,564.69 = 139,564.69 : x
2. Step 2: Convert to fraction form
   67,054.50/139,564.69 = 139,564.69/x
3. Step 3: Cross multiply
   67,054.50x = 139,564.69 × 139,564.69
4. Step 4: Simplify right side
   67,054.50x = 19,478,301,996.97
5. Step 5: Solve for x
   x = 19,478,301,996.97/67,054.50
6. Step 6: Final answer
   x = 290,484.64