Finding the Third Proportional to 99,964.13 and 215,920.69

Step by Step Solution

1. Step 1: Write the proportion equation
   99,964.13 : 215,920.69 = 215,920.69 : x
2. Step 2: Convert to fraction form
   99,964.13/215,920.69 = 215,920.69/x
3. Step 3: Cross multiply
   99,964.13x = 215,920.69 × 215,920.69
4. Step 4: Simplify right side
   99,964.13x = 46,621,743,290.47
5. Step 5: Solve for x
   x = 46,621,743,290.47/99,964.13
6. Step 6: Final answer
   x = 466,384.75