Finding the Third Proportional to 8,690,139 and 13,147,058

Step by Step Solution

1. Step 1: Write the proportion equation
   8,690,139 : 13,147,058 = 13,147,058 : x
2. Step 2: Convert to fraction form
   8,690,139/13,147,058 = 13,147,058/x
3. Step 3: Cross multiply
   8,690,139x = 13,147,058 × 13,147,058
4. Step 4: Simplify right side
   8,690,139x = 172,845,134,055,364
5. Step 5: Solve for x
   x = 172,845,134,055,364/8,690,139
6. Step 6: Final answer
   x = 19,889,800.85