Finding the Third Proportional to 143,428.50 and 315,171

Step by Step Solution

1. Step 1: Write the proportion equation
   143,428.50 : 315,171 = 315,171 : x
2. Step 2: Convert to fraction form
   143,428.50/315,171 = 315,171/x
3. Step 3: Cross multiply
   143,428.50x = 315,171 × 315,171
4. Step 4: Simplify right side
   143,428.50x = 99,332,759,241
5. Step 5: Solve for x
   x = 99,332,759,241/143,428.50
6. Step 6: Final answer
   x = 692,559.42