Finding the Third Proportional to 20,828,990 and 42,672,748

Step by Step Solution

1. Step 1: Write the proportion equation
   20,828,990 : 42,672,748 = 42,672,748 : x
2. Step 2: Convert to fraction form
   20,828,990/42,672,748 = 42,672,748/x
3. Step 3: Cross multiply
   20,828,990x = 42,672,748 × 42,672,748
4. Step 4: Simplify right side
   20,828,990x = 1,820,963,421,871,504
5. Step 5: Solve for x
   x = 1,820,963,421,871,504/20,828,990
6. Step 6: Final answer
   x = 87,424,470.50