Finding the Third Proportional to 253,986 and 555,196

Step by Step Solution

1. Step 1: Write the proportion equation
   253,986 : 555,196 = 555,196 : x
2. Step 2: Convert to fraction form
   253,986/555,196 = 555,196/x
3. Step 3: Cross multiply
   253,986x = 555,196 × 555,196
4. Step 4: Simplify right side
   253,986x = 308,242,598,416
5. Step 5: Solve for x
   x = 308,242,598,416/253,986
6. Step 6: Final answer
   x = 1,213,620.43