Finding the Third Proportional to 141,640 and 309,040

Step by Step Solution

1. Step 1: Write the proportion equation
   141,640 : 309,040 = 309,040 : x
2. Step 2: Convert to fraction form
   141,640/309,040 = 309,040/x
3. Step 3: Cross multiply
   141,640x = 309,040 × 309,040
4. Step 4: Simplify right side
   141,640x = 95,505,721,600
5. Step 5: Solve for x
   x = 95,505,721,600/141,640
6. Step 6: Final answer
   x = 674,284.96