Finding the Third Proportional to 99,189 and 218,061

Step by Step Solution

1. Step 1: Write the proportion equation
   99,189 : 218,061 = 218,061 : x
2. Step 2: Convert to fraction form
   99,189/218,061 = 218,061/x
3. Step 3: Cross multiply
   99,189x = 218,061 × 218,061
4. Step 4: Simplify right side
   99,189x = 47,550,599,721
5. Step 5: Solve for x
   x = 47,550,599,721/99,189
6. Step 6: Final answer
   x = 479,393.88