Finding the Third Proportional to 144,631 and 316,370

Step by Step Solution

1. Step 1: Write the proportion equation
   144,631 : 316,370 = 316,370 : x
2. Step 2: Convert to fraction form
   144,631/316,370 = 316,370/x
3. Step 3: Cross multiply
   144,631x = 316,370 × 316,370
4. Step 4: Simplify right side
   144,631x = 100,089,976,900
5. Step 5: Solve for x
   x = 100,089,976,900/144,631
6. Step 6: Final answer
   x = 692,036.82