Finding the Third Proportional to 99,553.50 and 218,790

Step by Step Solution

1. Step 1: Write the proportion equation
   99,553.50 : 218,790 = 218,790 : x
2. Step 2: Convert to fraction form
   99,553.50/218,790 = 218,790/x
3. Step 3: Cross multiply
   99,553.50x = 218,790 × 218,790
4. Step 4: Simplify right side
   99,553.50x = 47,869,064,100
5. Step 5: Solve for x
   x = 47,869,064,100/99,553.50
6. Step 6: Final answer
   x = 480,837.58