Finding the Third Proportional to 144,390 and 316,680

Step by Step Solution

1. Step 1: Write the proportion equation
   144,390 : 316,680 = 316,680 : x
2. Step 2: Convert to fraction form
   144,390/316,680 = 316,680/x
3. Step 3: Cross multiply
   144,390x = 316,680 × 316,680
4. Step 4: Simplify right side
   144,390x = 100,286,222,400
5. Step 5: Solve for x
   x = 100,286,222,400/144,390
6. Step 6: Final answer
   x = 694,551.02