Finding the Third Proportional to 64,316 and 139,040

Step by Step Solution

1. Step 1: Write the proportion equation
   64,316 : 139,040 = 139,040 : x
2. Step 2: Convert to fraction form
   64,316/139,040 = 139,040/x
3. Step 3: Cross multiply
   64,316x = 139,040 × 139,040
4. Step 4: Simplify right side
   64,316x = 19,332,121,600
5. Step 5: Solve for x
   x = 19,332,121,600/64,316
6. Step 6: Final answer
   x = 300,580.28