Finding the Third Proportional to 143,421 and 315,150

Step by Step Solution

1. Step 1: Write the proportion equation
   143,421 : 315,150 = 315,150 : x
2. Step 2: Convert to fraction form
   143,421/315,150 = 315,150/x
3. Step 3: Cross multiply
   143,421x = 315,150 × 315,150
4. Step 4: Simplify right side
   143,421x = 99,319,522,500
5. Step 5: Solve for x
   x = 99,319,522,500/143,421
6. Step 6: Final answer
   x = 692,503.35