Finding the Third Proportional to 381,449.25 and 558,486

Step by Step Solution

1. Step 1: Write the proportion equation
   381,449.25 : 558,486 = 558,486 : x
2. Step 2: Convert to fraction form
   381,449.25/558,486 = 558,486/x
3. Step 3: Cross multiply
   381,449.25x = 558,486 × 558,486
4. Step 4: Simplify right side
   381,449.25x = 311,906,612,196
5. Step 5: Solve for x
   x = 311,906,612,196/381,449.25
6. Step 6: Final answer
   x = 817,688.36