Finding the Third Proportional to 64,985.63 and 139,640.63

Step by Step Solution

1. Step 1: Write the proportion equation
   64,985.63 : 139,640.63 = 139,640.63 : x
2. Step 2: Convert to fraction form
   64,985.63/139,640.63 = 139,640.63/x
3. Step 3: Cross multiply
   64,985.63x = 139,640.63 × 139,640.63
4. Step 4: Simplify right side
   64,985.63x = 19,499,504,150.39
5. Step 5: Solve for x
   x = 19,499,504,150.39/64,985.63
6. Step 6: Final answer
   x = 300,058.73