Finding the Third Proportional to 645,905 and 1,390,522

Step by Step Solution

1. Step 1: Write the proportion equation
   645,905 : 1,390,522 = 1,390,522 : x
2. Step 2: Convert to fraction form
   645,905/1,390,522 = 1,390,522/x
3. Step 3: Cross multiply
   645,905x = 1,390,522 × 1,390,522
4. Step 4: Simplify right side
   645,905x = 1,933,551,432,484
5. Step 5: Solve for x
   x = 1,933,551,432,484/645,905
6. Step 6: Final answer
   x = 2,993,553.90