Finding the Third Proportional to 118,385 and 253,618

Step by Step Solution

1. Step 1: Write the proportion equation
   118,385 : 253,618 = 253,618 : x
2. Step 2: Convert to fraction form
   118,385/253,618 = 253,618/x
3. Step 3: Cross multiply
   118,385x = 253,618 × 253,618
4. Step 4: Simplify right side
   118,385x = 64,322,089,924
5. Step 5: Solve for x
   x = 64,322,089,924/118,385
6. Step 6: Final answer
   x = 543,329.73