Finding the Third Proportional to 8,139,709 and 12,956,785.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,139,709 : 12,956,785.50 = 12,956,785.50 : x
2. Step 2: Convert to fraction form
   8,139,709/12,956,785.50 = 12,956,785.50/x
3. Step 3: Cross multiply
   8,139,709x = 12,956,785.50 × 12,956,785.50
4. Step 4: Simplify right side
   8,139,709x = 167,878,290,493,010.25
5. Step 5: Solve for x
   x = 167,878,290,493,010.25/8,139,709
6. Step 6: Final answer
   x = 20,624,605.93