Finding the Third Proportional to 1,061,644 and 1,688,640

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061,644 : 1,688,640 = 1,688,640 : x
2. Step 2: Convert to fraction form
   1,061,644/1,688,640 = 1,688,640/x
3. Step 3: Cross multiply
   1,061,644x = 1,688,640 × 1,688,640
4. Step 4: Simplify right side
   1,061,644x = 2,851,505,049,600
5. Step 5: Solve for x
   x = 2,851,505,049,600/1,061,644
6. Step 6: Final answer
   x = 2,685,933.37