Finding the Third Proportional to 8,690,142 and 13,147,062

Step by Step Solution

1. Step 1: Write the proportion equation
   8,690,142 : 13,147,062 = 13,147,062 : x
2. Step 2: Convert to fraction form
   8,690,142/13,147,062 = 13,147,062/x
3. Step 3: Cross multiply
   8,690,142x = 13,147,062 × 13,147,062
4. Step 4: Simplify right side
   8,690,142x = 172,845,239,231,844
5. Step 5: Solve for x
   x = 172,845,239,231,844/8,690,142
6. Step 6: Final answer
   x = 19,889,806.09