Finding the Third Proportional to 99,661.50 and 218,010

Step by Step Solution

1. Step 1: Write the proportion equation
   99,661.50 : 218,010 = 218,010 : x
2. Step 2: Convert to fraction form
   99,661.50/218,010 = 218,010/x
3. Step 3: Cross multiply
   99,661.50x = 218,010 × 218,010
4. Step 4: Simplify right side
   99,661.50x = 47,528,360,100
5. Step 5: Solve for x
   x = 47,528,360,100/99,661.50
6. Step 6: Final answer
   x = 476,897.90