Finding the Third Proportional to 643,724 and 973,870

Step by Step Solution

1. Step 1: Write the proportion equation
   643,724 : 973,870 = 973,870 : x
2. Step 2: Convert to fraction form
   643,724/973,870 = 973,870/x
3. Step 3: Cross multiply
   643,724x = 973,870 × 973,870
4. Step 4: Simplify right side
   643,724x = 948,422,776,900
5. Step 5: Solve for x
   x = 948,422,776,900/643,724
6. Step 6: Final answer
   x = 1,473,337.61