Finding the Third Proportional to 213,871.50 and 331,121

Step by Step Solution

1. Step 1: Write the proportion equation
   213,871.50 : 331,121 = 331,121 : x
2. Step 2: Convert to fraction form
   213,871.50/331,121 = 331,121/x
3. Step 3: Cross multiply
   213,871.50x = 331,121 × 331,121
4. Step 4: Simplify right side
   213,871.50x = 109,641,116,641
5. Step 5: Solve for x
   x = 109,641,116,641/213,871.50
6. Step 6: Final answer
   x = 512,649.50