Finding the Third Proportional to 253,458 and 392,319.75

Step by Step Solution

1. Step 1: Write the proportion equation
   253,458 : 392,319.75 = 392,319.75 : x
2. Step 2: Convert to fraction form
   253,458/392,319.75 = 392,319.75/x
3. Step 3: Cross multiply
   253,458x = 392,319.75 × 392,319.75
4. Step 4: Simplify right side
   253,458x = 153,914,786,240.06
5. Step 5: Solve for x
   x = 153,914,786,240.06/253,458
6. Step 6: Final answer
   x = 607,259.53