Finding the Third Proportional to 370,940 and 558,150

Step by Step Solution

1. Step 1: Write the proportion equation
   370,940 : 558,150 = 558,150 : x
2. Step 2: Convert to fraction form
   370,940/558,150 = 558,150/x
3. Step 3: Cross multiply
   370,940x = 558,150 × 558,150
4. Step 4: Simplify right side
   370,940x = 311,531,422,500
5. Step 5: Solve for x
   x = 311,531,422,500/370,940
6. Step 6: Final answer
   x = 839,843.16