Finding the Third Proportional to 645,810 and 1,407,876

Step by Step Solution

1. Step 1: Write the proportion equation
   645,810 : 1,407,876 = 1,407,876 : x
2. Step 2: Convert to fraction form
   645,810/1,407,876 = 1,407,876/x
3. Step 3: Cross multiply
   645,810x = 1,407,876 × 1,407,876
4. Step 4: Simplify right side
   645,810x = 1,982,114,831,376
5. Step 5: Solve for x
   x = 1,982,114,831,376/645,810
6. Step 6: Final answer
   x = 3,069,191.92