Finding the Third Proportional to 143,239.50 and 311,967

Step by Step Solution

1. Step 1: Write the proportion equation
   143,239.50 : 311,967 = 311,967 : x
2. Step 2: Convert to fraction form
   143,239.50/311,967 = 311,967/x
3. Step 3: Cross multiply
   143,239.50x = 311,967 × 311,967
4. Step 4: Simplify right side
   143,239.50x = 97,323,409,089
5. Step 5: Solve for x
   x = 97,323,409,089/143,239.50
6. Step 6: Final answer
   x = 679,445.33