Finding the Third Proportional to 263,242 and 384,990

Step by Step Solution

1. Step 1: Write the proportion equation
   263,242 : 384,990 = 384,990 : x
2. Step 2: Convert to fraction form
   263,242/384,990 = 384,990/x
3. Step 3: Cross multiply
   263,242x = 384,990 × 384,990
4. Step 4: Simplify right side
   263,242x = 148,217,300,100
5. Step 5: Solve for x
   x = 148,217,300,100/263,242
6. Step 6: Final answer
   x = 563,045.79