Finding the Third Proportional to 144,906 and 315,560

Step by Step Solution

1. Step 1: Write the proportion equation
   144,906 : 315,560 = 315,560 : x
2. Step 2: Convert to fraction form
   144,906/315,560 = 315,560/x
3. Step 3: Cross multiply
   144,906x = 315,560 × 315,560
4. Step 4: Simplify right side
   144,906x = 99,578,113,600
5. Step 5: Solve for x
   x = 99,578,113,600/144,906
6. Step 6: Final answer
   x = 687,191.10