Finding the Third Proportional to 12,861,772 and 19,906,206

Step by Step Solution

1. Step 1: Write the proportion equation
   12,861,772 : 19,906,206 = 19,906,206 : x
2. Step 2: Convert to fraction form
   12,861,772/19,906,206 = 19,906,206/x
3. Step 3: Cross multiply
   12,861,772x = 19,906,206 × 19,906,206
4. Step 4: Simplify right side
   12,861,772x = 396,257,037,314,436
5. Step 5: Solve for x
   x = 396,257,037,314,436/12,861,772
6. Step 6: Final answer
   x = 30,808,899.22