Finding the Third Proportional to 5,640,745 and 8,719,871

Step by Step Solution

1. Step 1: Write the proportion equation
   5,640,745 : 8,719,871 = 8,719,871 : x
2. Step 2: Convert to fraction form
   5,640,745/8,719,871 = 8,719,871/x
3. Step 3: Cross multiply
   5,640,745x = 8,719,871 × 8,719,871
4. Step 4: Simplify right side
   5,640,745x = 76,036,150,256,641
5. Step 5: Solve for x
   x = 76,036,150,256,641/5,640,745
6. Step 6: Final answer
   x = 13,479,806.35