Finding the Third Proportional to 10,007,972 and 21,812,208

Step by Step Solution

1. Step 1: Write the proportion equation
   10,007,972 : 21,812,208 = 21,812,208 : x
2. Step 2: Convert to fraction form
   10,007,972/21,812,208 = 21,812,208/x
3. Step 3: Cross multiply
   10,007,972x = 21,812,208 × 21,812,208
4. Step 4: Simplify right side
   10,007,972x = 475,772,417,835,264
5. Step 5: Solve for x
   x = 475,772,417,835,264/10,007,972
6. Step 6: Final answer
   x = 47,539,343.42