Finding the Third Proportional to 20,861,899.50 and 42,313,356

Step by Step Solution

1. Step 1: Write the proportion equation
   20,861,899.50 : 42,313,356 = 42,313,356 : x
2. Step 2: Convert to fraction form
   20,861,899.50/42,313,356 = 42,313,356/x
3. Step 3: Cross multiply
   20,861,899.50x = 42,313,356 × 42,313,356
4. Step 4: Simplify right side
   20,861,899.50x = 1,790,420,095,982,736
5. Step 5: Solve for x
   x = 1,790,420,095,982,736/20,861,899.50
6. Step 6: Final answer
   x = 85,822,486.87