Finding the Third Proportional to 142,856 and 215,580

Step by Step Solution

1. Step 1: Write the proportion equation
   142,856 : 215,580 = 215,580 : x
2. Step 2: Convert to fraction form
   142,856/215,580 = 215,580/x
3. Step 3: Cross multiply
   142,856x = 215,580 × 215,580
4. Step 4: Simplify right side
   142,856x = 46,474,736,400
5. Step 5: Solve for x
   x = 46,474,736,400/142,856
6. Step 6: Final answer
   x = 325,325.76