Finding the Third Proportional to 64,160.50 and 139,609.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64,160.50 : 139,609.50 = 139,609.50 : x
2. Step 2: Convert to fraction form
   64,160.50/139,609.50 = 139,609.50/x
3. Step 3: Cross multiply
   64,160.50x = 139,609.50 × 139,609.50
4. Step 4: Simplify right side
   64,160.50x = 19,490,812,490.25
5. Step 5: Solve for x
   x = 19,490,812,490.25/64,160.50
6. Step 6: Final answer
   x = 303,782.12