Finding the Third Proportional to 253,150 and 392,488

Step by Step Solution

1. Step 1: Write the proportion equation
   253,150 : 392,488 = 392,488 : x
2. Step 2: Convert to fraction form
   253,150/392,488 = 392,488/x
3. Step 3: Cross multiply
   253,150x = 392,488 × 392,488
4. Step 4: Simplify right side
   253,150x = 154,046,830,144
5. Step 5: Solve for x
   x = 154,046,830,144/253,150
6. Step 6: Final answer
   x = 608,519.97