Finding the Third Proportional to 558,921 and 790,105

Step by Step Solution

1. Step 1: Write the proportion equation
   558,921 : 790,105 = 790,105 : x
2. Step 2: Convert to fraction form
   558,921/790,105 = 790,105/x
3. Step 3: Cross multiply
   558,921x = 790,105 × 790,105
4. Step 4: Simplify right side
   558,921x = 624,265,911,025
5. Step 5: Solve for x
   x = 624,265,911,025/558,921
6. Step 6: Final answer
   x = 1,116,912.61