Finding the Third Proportional to 19,902,521 and 42,571,664

Step by Step Solution

1. Step 1: Write the proportion equation
   19,902,521 : 42,571,664 = 42,571,664 : x
2. Step 2: Convert to fraction form
   19,902,521/42,571,664 = 42,571,664/x
3. Step 3: Cross multiply
   19,902,521x = 42,571,664 × 42,571,664
4. Step 4: Simplify right side
   19,902,521x = 1,812,346,575,728,896
5. Step 5: Solve for x
   x = 1,812,346,575,728,896/19,902,521
6. Step 6: Final answer
   x = 91,061,156.31