Finding the Third Proportional to 99,861 and 217,354.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,861 : 217,354.50 = 217,354.50 : x
2. Step 2: Convert to fraction form
   99,861/217,354.50 = 217,354.50/x
3. Step 3: Cross multiply
   99,861x = 217,354.50 × 217,354.50
4. Step 4: Simplify right side
   99,861x = 47,242,978,670.25
5. Step 5: Solve for x
   x = 47,242,978,670.25/99,861
6. Step 6: Final answer
   x = 473,087.38