Finding the Third Proportional to 5,187,969 and 8,287,857

Step by Step Solution

1. Step 1: Write the proportion equation
   5,187,969 : 8,287,857 = 8,287,857 : x
2. Step 2: Convert to fraction form
   5,187,969/8,287,857 = 8,287,857/x
3. Step 3: Cross multiply
   5,187,969x = 8,287,857 × 8,287,857
4. Step 4: Simplify right side
   5,187,969x = 68,688,573,652,449
5. Step 5: Solve for x
   x = 68,688,573,652,449/5,187,969
6. Step 6: Final answer
   x = 13,239,973.80