Finding the Third Proportional to 623,870 and 869,238

Step by Step Solution

1. Step 1: Write the proportion equation
   623,870 : 869,238 = 869,238 : x
2. Step 2: Convert to fraction form
   623,870/869,238 = 869,238/x
3. Step 3: Cross multiply
   623,870x = 869,238 × 869,238
4. Step 4: Simplify right side
   623,870x = 755,574,700,644
5. Step 5: Solve for x
   x = 755,574,700,644/623,870
6. Step 6: Final answer
   x = 1,211,109.21