Finding the Third Proportional to 99,810 and 143,485

Step by Step Solution

1. Step 1: Write the proportion equation
   99,810 : 143,485 = 143,485 : x
2. Step 2: Convert to fraction form
   99,810/143,485 = 143,485/x
3. Step 3: Cross multiply
   99,810x = 143,485 × 143,485
4. Step 4: Simplify right side
   99,810x = 20,587,945,225
5. Step 5: Solve for x
   x = 20,587,945,225/99,810
6. Step 6: Final answer
   x = 206,271.37