Finding the Third Proportional to 8,687,538 and 12,985,380

Step by Step Solution

1. Step 1: Write the proportion equation
   8,687,538 : 12,985,380 = 12,985,380 : x
2. Step 2: Convert to fraction form
   8,687,538/12,985,380 = 12,985,380/x
3. Step 3: Cross multiply
   8,687,538x = 12,985,380 × 12,985,380
4. Step 4: Simplify right side
   8,687,538x = 168,620,093,744,400
5. Step 5: Solve for x
   x = 168,620,093,744,400/8,687,538
6. Step 6: Final answer
   x = 19,409,422.29