Finding the Third Proportional to 8,690,138 and 13,147,054

Step by Step Solution

1. Step 1: Write the proportion equation
   8,690,138 : 13,147,054 = 13,147,054 : x
2. Step 2: Convert to fraction form
   8,690,138/13,147,054 = 13,147,054/x
3. Step 3: Cross multiply
   8,690,138x = 13,147,054 × 13,147,054
4. Step 4: Simplify right side
   8,690,138x = 172,845,028,878,916
5. Step 5: Solve for x
   x = 172,845,028,878,916/8,690,138
6. Step 6: Final answer
   x = 19,889,791.03