Finding the Third Proportional to 5,687,415 and 8,721,216

Step by Step Solution

1. Step 1: Write the proportion equation
   5,687,415 : 8,721,216 = 8,721,216 : x
2. Step 2: Convert to fraction form
   5,687,415/8,721,216 = 8,721,216/x
3. Step 3: Cross multiply
   5,687,415x = 8,721,216 × 8,721,216
4. Step 4: Simplify right side
   5,687,415x = 76,059,608,518,656
5. Step 5: Solve for x
   x = 76,059,608,518,656/5,687,415
6. Step 6: Final answer
   x = 13,373,317.85