Finding the Third Proportional to 99,783.56 and 221,710.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,783.56 : 221,710.50 = 221,710.50 : x
2. Step 2: Convert to fraction form
   99,783.56/221,710.50 = 221,710.50/x
3. Step 3: Cross multiply
   99,783.56x = 221,710.50 × 221,710.50
4. Step 4: Simplify right side
   99,783.56x = 49,155,545,810.25
5. Step 5: Solve for x
   x = 49,155,545,810.25/99,783.56
6. Step 6: Final answer
   x = 492,621.68