Finding the Third Proportional to 8,521,880 and 13,222,455

Step by Step Solution

1. Step 1: Write the proportion equation
   8,521,880 : 13,222,455 = 13,222,455 : x
2. Step 2: Convert to fraction form
   8,521,880/13,222,455 = 13,222,455/x
3. Step 3: Cross multiply
   8,521,880x = 13,222,455 × 13,222,455
4. Step 4: Simplify right side
   8,521,880x = 174,833,316,227,025
5. Step 5: Solve for x
   x = 174,833,316,227,025/8,521,880
6. Step 6: Final answer
   x = 20,515,815.32