Finding the Third Proportional to 253,431 and 354,313.50

Step by Step Solution

1. Step 1: Write the proportion equation
   253,431 : 354,313.50 = 354,313.50 : x
2. Step 2: Convert to fraction form
   253,431/354,313.50 = 354,313.50/x
3. Step 3: Cross multiply
   253,431x = 354,313.50 × 354,313.50
4. Step 4: Simplify right side
   253,431x = 125,538,056,282.25
5. Step 5: Solve for x
   x = 125,538,056,282.25/253,431
6. Step 6: Final answer
   x = 495,353.99