Finding the Third Proportional to 118,396 and 253,640

Step by Step Solution

1. Step 1: Write the proportion equation
   118,396 : 253,640 = 253,640 : x
2. Step 2: Convert to fraction form
   118,396/253,640 = 253,640/x
3. Step 3: Cross multiply
   118,396x = 253,640 × 253,640
4. Step 4: Simplify right side
   118,396x = 64,333,249,600
5. Step 5: Solve for x
   x = 64,333,249,600/118,396
6. Step 6: Final answer
   x = 543,373.51