Finding the Third Proportional to 123,240 and 252,321

Step by Step Solution

1. Step 1: Write the proportion equation
   123,240 : 252,321 = 252,321 : x
2. Step 2: Convert to fraction form
   123,240/252,321 = 252,321/x
3. Step 3: Cross multiply
   123,240x = 252,321 × 252,321
4. Step 4: Simplify right side
   123,240x = 63,665,887,041
5. Step 5: Solve for x
   x = 63,665,887,041/123,240
6. Step 6: Final answer
   x = 516,600.84