Finding the Third Proportional to 142,576.50 and 213,436.50

Step by Step Solution

1. Step 1: Write the proportion equation
   142,576.50 : 213,436.50 = 213,436.50 : x
2. Step 2: Convert to fraction form
   142,576.50/213,436.50 = 213,436.50/x
3. Step 3: Cross multiply
   142,576.50x = 213,436.50 × 213,436.50
4. Step 4: Simplify right side
   142,576.50x = 45,555,139,532.25
5. Step 5: Solve for x
   x = 45,555,139,532.25/142,576.50
6. Step 6: Final answer
   x = 319,513.66