Finding the Third Proportional to 279,500 and 395,112

Step by Step Solution

1. Step 1: Write the proportion equation
   279,500 : 395,112 = 395,112 : x
2. Step 2: Convert to fraction form
   279,500/395,112 = 395,112/x
3. Step 3: Cross multiply
   279,500x = 395,112 × 395,112
4. Step 4: Simplify right side
   279,500x = 156,113,492,544
5. Step 5: Solve for x
   x = 156,113,492,544/279,500
6. Step 6: Final answer
   x = 558,545.59