Finding the Third Proportional to 259,915.50 and 558,508.50

Step by Step Solution

1. Step 1: Write the proportion equation
   259,915.50 : 558,508.50 = 558,508.50 : x
2. Step 2: Convert to fraction form
   259,915.50/558,508.50 = 558,508.50/x
3. Step 3: Cross multiply
   259,915.50x = 558,508.50 × 558,508.50
4. Step 4: Simplify right side
   259,915.50x = 311,931,744,572.25
5. Step 5: Solve for x
   x = 311,931,744,572.25/259,915.50
6. Step 6: Final answer
   x = 1,200,127.52