Finding the Third Proportional to 12,861,807 and 19,906,258.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,861,807 : 19,906,258.50 = 19,906,258.50 : x
2. Step 2: Convert to fraction form
   12,861,807/19,906,258.50 = 19,906,258.50/x
3. Step 3: Cross multiply
   12,861,807x = 19,906,258.50 × 19,906,258.50
4. Step 4: Simplify right side
   12,861,807x = 396,259,127,468,822.25
5. Step 5: Solve for x
   x = 396,259,127,468,822.25/12,861,807
6. Step 6: Final answer
   x = 30,808,977.89