Finding the Third Proportional to 8,513,466 and 18,916,499

Step by Step Solution

1. Step 1: Write the proportion equation
   8,513,466 : 18,916,499 = 18,916,499 : x
2. Step 2: Convert to fraction form
   8,513,466/18,916,499 = 18,916,499/x
3. Step 3: Cross multiply
   8,513,466x = 18,916,499 × 18,916,499
4. Step 4: Simplify right side
   8,513,466x = 357,833,934,417,001
5. Step 5: Solve for x
   x = 357,833,934,417,001/8,513,466
6. Step 6: Final answer
   x = 42,031,522.11