Finding the Third Proportional to 8,690,144 and 13,147,064

Step by Step Solution

1. Step 1: Write the proportion equation
   8,690,144 : 13,147,064 = 13,147,064 : x
2. Step 2: Convert to fraction form
   8,690,144/13,147,064 = 13,147,064/x
3. Step 3: Cross multiply
   8,690,144x = 13,147,064 × 13,147,064
4. Step 4: Simplify right side
   8,690,144x = 172,845,291,820,096
5. Step 5: Solve for x
   x = 172,845,291,820,096/8,690,144
6. Step 6: Final answer
   x = 19,889,807.56