Finding the Third Proportional to 257,115 and 558,454.50

Step by Step Solution

1. Step 1: Write the proportion equation
   257,115 : 558,454.50 = 558,454.50 : x
2. Step 2: Convert to fraction form
   257,115/558,454.50 = 558,454.50/x
3. Step 3: Cross multiply
   257,115x = 558,454.50 × 558,454.50
4. Step 4: Simplify right side
   257,115x = 311,871,428,570.25
5. Step 5: Solve for x
   x = 311,871,428,570.25/257,115
6. Step 6: Final answer
   x = 1,212,964.74