Finding the Third Proportional to 99,072 and 215,640

Step by Step Solution

1. Step 1: Write the proportion equation
   99,072 : 215,640 = 215,640 : x
2. Step 2: Convert to fraction form
   99,072/215,640 = 215,640/x
3. Step 3: Cross multiply
   99,072x = 215,640 × 215,640
4. Step 4: Simplify right side
   99,072x = 46,500,609,600
5. Step 5: Solve for x
   x = 46,500,609,600/99,072
6. Step 6: Final answer
   x = 469,361.77