Finding the Third Proportional to 99,712 and 215,078

Step by Step Solution

1. Step 1: Write the proportion equation
   99,712 : 215,078 = 215,078 : x
2. Step 2: Convert to fraction form
   99,712/215,078 = 215,078/x
3. Step 3: Cross multiply
   99,712x = 215,078 × 215,078
4. Step 4: Simplify right side
   99,712x = 46,258,546,084
5. Step 5: Solve for x
   x = 46,258,546,084/99,712
6. Step 6: Final answer
   x = 463,921.55