Finding the Third Proportional to 99,742.50 and 218,556

Step by Step Solution

1. Step 1: Write the proportion equation
   99,742.50 : 218,556 = 218,556 : x
2. Step 2: Convert to fraction form
   99,742.50/218,556 = 218,556/x
3. Step 3: Cross multiply
   99,742.50x = 218,556 × 218,556
4. Step 4: Simplify right side
   99,742.50x = 47,766,725,136
5. Step 5: Solve for x
   x = 47,766,725,136/99,742.50
6. Step 6: Final answer
   x = 478,900.42