Finding the Third Proportional to 144,632 and 311,490

Step by Step Solution

1. Step 1: Write the proportion equation
   144,632 : 311,490 = 311,490 : x
2. Step 2: Convert to fraction form
   144,632/311,490 = 311,490/x
3. Step 3: Cross multiply
   144,632x = 311,490 × 311,490
4. Step 4: Simplify right side
   144,632x = 97,026,020,100
5. Step 5: Solve for x
   x = 97,026,020,100/144,632
6. Step 6: Final answer
   x = 670,847.53