Finding the Third Proportional to 8,461,528 and 12,890,686

Step by Step Solution

1. Step 1: Write the proportion equation
   8,461,528 : 12,890,686 = 12,890,686 : x
2. Step 2: Convert to fraction form
   8,461,528/12,890,686 = 12,890,686/x
3. Step 3: Cross multiply
   8,461,528x = 12,890,686 × 12,890,686
4. Step 4: Simplify right side
   8,461,528x = 166,169,785,550,596
5. Step 5: Solve for x
   x = 166,169,785,550,596/8,461,528
6. Step 6: Final answer
   x = 19,638,271.66