Finding the Third Proportional to 144,592.50 and 313,320

Step by Step Solution

1. Step 1: Write the proportion equation
   144,592.50 : 313,320 = 313,320 : x
2. Step 2: Convert to fraction form
   144,592.50/313,320 = 313,320/x
3. Step 3: Cross multiply
   144,592.50x = 313,320 × 313,320
4. Step 4: Simplify right side
   144,592.50x = 98,169,422,400
5. Step 5: Solve for x
   x = 98,169,422,400/144,592.50
6. Step 6: Final answer
   x = 678,938.55