Finding the Third Proportional to 99,721.50 and 215,095.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,721.50 : 215,095.50 = 215,095.50 : x
2. Step 2: Convert to fraction form
   99,721.50/215,095.50 = 215,095.50/x
3. Step 3: Cross multiply
   99,721.50x = 215,095.50 × 215,095.50
4. Step 4: Simplify right side
   99,721.50x = 46,266,074,120.25
5. Step 5: Solve for x
   x = 46,266,074,120.25/99,721.50
6. Step 6: Final answer
   x = 463,952.85