Finding the Third Proportional to 64,109.81 and 139,508.06

Step by Step Solution

1. Step 1: Write the proportion equation
   64,109.81 : 139,508.06 = 139,508.06 : x
2. Step 2: Convert to fraction form
   64,109.81/139,508.06 = 139,508.06/x
3. Step 3: Cross multiply
   64,109.81x = 139,508.06 × 139,508.06
4. Step 4: Simplify right side
   64,109.81x = 19,462,499,502.50
5. Step 5: Solve for x
   x = 19,462,499,502.50/64,109.81
6. Step 6: Final answer
   x = 303,580.66