Finding the Third Proportional to 161,889 and 253,399.50

Step by Step Solution

1. Step 1: Write the proportion equation
   161,889 : 253,399.50 = 253,399.50 : x
2. Step 2: Convert to fraction form
   161,889/253,399.50 = 253,399.50/x
3. Step 3: Cross multiply
   161,889x = 253,399.50 × 253,399.50
4. Step 4: Simplify right side
   161,889x = 64,211,306,600.25
5. Step 5: Solve for x
   x = 64,211,306,600.25/161,889
6. Step 6: Final answer
   x = 396,637.86