Finding the Third Proportional to 143,432 and 315,172

Step by Step Solution

1. Step 1: Write the proportion equation
   143,432 : 315,172 = 315,172 : x
2. Step 2: Convert to fraction form
   143,432/315,172 = 315,172/x
3. Step 3: Cross multiply
   143,432x = 315,172 × 315,172
4. Step 4: Simplify right side
   143,432x = 99,333,389,584
5. Step 5: Solve for x
   x = 99,333,389,584/143,432
6. Step 6: Final answer
   x = 692,546.92