Finding the Third Proportional to 161,813 and 253,287.50

Step by Step Solution

1. Step 1: Write the proportion equation
   161,813 : 253,287.50 = 253,287.50 : x
2. Step 2: Convert to fraction form
   161,813/253,287.50 = 253,287.50/x
3. Step 3: Cross multiply
   161,813x = 253,287.50 × 253,287.50
4. Step 4: Simplify right side
   161,813x = 64,154,557,656.25
5. Step 5: Solve for x
   x = 64,154,557,656.25/161,813
6. Step 6: Final answer
   x = 396,473.45