Finding the Third Proportional to 312,426 and 647,005.50

Step by Step Solution

1. Step 1: Write the proportion equation
   312,426 : 647,005.50 = 647,005.50 : x
2. Step 2: Convert to fraction form
   312,426/647,005.50 = 647,005.50/x
3. Step 3: Cross multiply
   312,426x = 647,005.50 × 647,005.50
4. Step 4: Simplify right side
   312,426x = 418,616,117,030.25
5. Step 5: Solve for x
   x = 418,616,117,030.25/312,426
6. Step 6: Final answer
   x = 1,339,888.86