Finding the Third Proportional to 143,824.50 and 312,900

Step by Step Solution

1. Step 1: Write the proportion equation
   143,824.50 : 312,900 = 312,900 : x
2. Step 2: Convert to fraction form
   143,824.50/312,900 = 312,900/x
3. Step 3: Cross multiply
   143,824.50x = 312,900 × 312,900
4. Step 4: Simplify right side
   143,824.50x = 97,906,410,000
5. Step 5: Solve for x
   x = 97,906,410,000/143,824.50
6. Step 6: Final answer
   x = 680,735.27