Finding the Third Proportional to 259,811.50 and 558,300

Step by Step Solution

1. Step 1: Write the proportion equation
   259,811.50 : 558,300 = 558,300 : x
2. Step 2: Convert to fraction form
   259,811.50/558,300 = 558,300/x
3. Step 3: Cross multiply
   259,811.50x = 558,300 × 558,300
4. Step 4: Simplify right side
   259,811.50x = 311,698,890,000
5. Step 5: Solve for x
   x = 311,698,890,000/259,811.50
6. Step 6: Final answer
   x = 1,199,711.68