Finding the Third Proportional to 21,720,678 and 42,893,100

Step by Step Solution

1. Step 1: Write the proportion equation
   21,720,678 : 42,893,100 = 42,893,100 : x
2. Step 2: Convert to fraction form
   21,720,678/42,893,100 = 42,893,100/x
3. Step 3: Cross multiply
   21,720,678x = 42,893,100 × 42,893,100
4. Step 4: Simplify right side
   21,720,678x = 1,839,818,027,610,000
5. Step 5: Solve for x
   x = 1,839,818,027,610,000/21,720,678
6. Step 6: Final answer
   x = 84,703,526.64