Finding the Third Proportional to 643,721 and 973,864.50

Step by Step Solution

1. Step 1: Write the proportion equation
   643,721 : 973,864.50 = 973,864.50 : x
2. Step 2: Convert to fraction form
   643,721/973,864.50 = 973,864.50/x
3. Step 3: Cross multiply
   643,721x = 973,864.50 × 973,864.50
4. Step 4: Simplify right side
   643,721x = 948,412,064,360.25
5. Step 5: Solve for x
   x = 948,412,064,360.25/643,721
6. Step 6: Final answer
   x = 1,473,327.83