Finding the Third Proportional to 115,290 and 250,780

Step by Step Solution

1. Step 1: Write the proportion equation
   115,290 : 250,780 = 250,780 : x
2. Step 2: Convert to fraction form
   115,290/250,780 = 250,780/x
3. Step 3: Cross multiply
   115,290x = 250,780 × 250,780
4. Step 4: Simplify right side
   115,290x = 62,890,608,400
5. Step 5: Solve for x
   x = 62,890,608,400/115,290
6. Step 6: Final answer
   x = 545,499.25