Finding the Third Proportional to 686,664 and 1,061,136

Step by Step Solution

1. Step 1: Write the proportion equation
   686,664 : 1,061,136 = 1,061,136 : x
2. Step 2: Convert to fraction form
   686,664/1,061,136 = 1,061,136/x
3. Step 3: Cross multiply
   686,664x = 1,061,136 × 1,061,136
4. Step 4: Simplify right side
   686,664x = 1,126,009,610,496
5. Step 5: Solve for x
   x = 1,126,009,610,496/686,664
6. Step 6: Final answer
   x = 1,639,826.19