Finding the Third Proportional to 257,112 and 558,448.50

Step by Step Solution

1. Step 1: Write the proportion equation
   257,112 : 558,448.50 = 558,448.50 : x
2. Step 2: Convert to fraction form
   257,112/558,448.50 = 558,448.50/x
3. Step 3: Cross multiply
   257,112x = 558,448.50 × 558,448.50
4. Step 4: Simplify right side
   257,112x = 311,864,727,152.25
5. Step 5: Solve for x
   x = 311,864,727,152.25/257,112
6. Step 6: Final answer
   x = 1,212,952.83