Finding the Third Proportional to 99,763.50 and 221,671.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,763.50 : 221,671.50 = 221,671.50 : x
2. Step 2: Convert to fraction form
   99,763.50/221,671.50 = 221,671.50/x
3. Step 3: Cross multiply
   99,763.50x = 221,671.50 × 221,671.50
4. Step 4: Simplify right side
   99,763.50x = 49,138,253,912.25
5. Step 5: Solve for x
   x = 49,138,253,912.25/99,763.50
6. Step 6: Final answer
   x = 492,547.41