Finding the Third Proportional to 307,908 and 661,656

Step by Step Solution

1. Step 1: Write the proportion equation
   307,908 : 661,656 = 661,656 : x
2. Step 2: Convert to fraction form
   307,908/661,656 = 661,656/x
3. Step 3: Cross multiply
   307,908x = 661,656 × 661,656
4. Step 4: Simplify right side
   307,908x = 437,788,662,336
5. Step 5: Solve for x
   x = 437,788,662,336/307,908
6. Step 6: Final answer
   x = 1,421,816.46