Finding the Third Proportional to 105,478 and 230,990

Step by Step Solution

1. Step 1: Write the proportion equation
   105,478 : 230,990 = 230,990 : x
2. Step 2: Convert to fraction form
   105,478/230,990 = 230,990/x
3. Step 3: Cross multiply
   105,478x = 230,990 × 230,990
4. Step 4: Simplify right side
   105,478x = 53,356,380,100
5. Step 5: Solve for x
   x = 53,356,380,100/105,478
6. Step 6: Final answer
   x = 505,853.16