Finding the Third Proportional to 143,424 and 315,162

Step by Step Solution

1. Step 1: Write the proportion equation
   143,424 : 315,162 = 315,162 : x
2. Step 2: Convert to fraction form
   143,424/315,162 = 315,162/x
3. Step 3: Cross multiply
   143,424x = 315,162 × 315,162
4. Step 4: Simplify right side
   143,424x = 99,327,086,244
5. Step 5: Solve for x
   x = 99,327,086,244/143,424
6. Step 6: Final answer
   x = 692,541.60