Finding the Third Proportional to 143,515.50 and 312,864

Step by Step Solution

1. Step 1: Write the proportion equation
   143,515.50 : 312,864 = 312,864 : x
2. Step 2: Convert to fraction form
   143,515.50/312,864 = 312,864/x
3. Step 3: Cross multiply
   143,515.50x = 312,864 × 312,864
4. Step 4: Simplify right side
   143,515.50x = 97,883,882,496
5. Step 5: Solve for x
   x = 97,883,882,496/143,515.50
6. Step 6: Final answer
   x = 682,043.98