Finding the Third Proportional to 5,687,420 and 8,721,222

Step by Step Solution

1. Step 1: Write the proportion equation
   5,687,420 : 8,721,222 = 8,721,222 : x
2. Step 2: Convert to fraction form
   5,687,420/8,721,222 = 8,721,222/x
3. Step 3: Cross multiply
   5,687,420x = 8,721,222 × 8,721,222
4. Step 4: Simplify right side
   5,687,420x = 76,059,713,173,284
5. Step 5: Solve for x
   x = 76,059,713,173,284/5,687,420
6. Step 6: Final answer
   x = 13,373,324.49