Finding the Third Proportional to 307,040 and 660,736

Step by Step Solution

1. Step 1: Write the proportion equation
   307,040 : 660,736 = 660,736 : x
2. Step 2: Convert to fraction form
   307,040/660,736 = 660,736/x
3. Step 3: Cross multiply
   307,040x = 660,736 × 660,736
4. Step 4: Simplify right side
   307,040x = 436,572,061,696
5. Step 5: Solve for x
   x = 436,572,061,696/307,040
6. Step 6: Final answer
   x = 1,421,873.57