Finding the Third Proportional to 421,443 and 912,870

Step by Step Solution

1. Step 1: Write the proportion equation
   421,443 : 912,870 = 912,870 : x
2. Step 2: Convert to fraction form
   421,443/912,870 = 912,870/x
3. Step 3: Cross multiply
   421,443x = 912,870 × 912,870
4. Step 4: Simplify right side
   421,443x = 833,331,636,900
5. Step 5: Solve for x
   x = 833,331,636,900/421,443
6. Step 6: Final answer
   x = 1,977,329.41