Finding the Third Proportional to 866,404 and 1,299,606

Step by Step Solution

1. Step 1: Write the proportion equation
   866,404 : 1,299,606 = 1,299,606 : x
2. Step 2: Convert to fraction form
   866,404/1,299,606 = 1,299,606/x
3. Step 3: Cross multiply
   866,404x = 1,299,606 × 1,299,606
4. Step 4: Simplify right side
   866,404x = 1,688,975,755,236
5. Step 5: Solve for x
   x = 1,688,975,755,236/866,404
6. Step 6: Final answer
   x = 1,949,409