Finding the Third Proportional to 99,987 and 216,012

Step by Step Solution

1. Step 1: Write the proportion equation
   99,987 : 216,012 = 216,012 : x
2. Step 2: Convert to fraction form
   99,987/216,012 = 216,012/x
3. Step 3: Cross multiply
   99,987x = 216,012 × 216,012
4. Step 4: Simplify right side
   99,987x = 46,661,184,144
5. Step 5: Solve for x
   x = 46,661,184,144/99,987
6. Step 6: Final answer
   x = 466,672.51