Finding the Third Proportional to 117,515 and 256,078

Step by Step Solution

1. Step 1: Write the proportion equation
   117,515 : 256,078 = 256,078 : x
2. Step 2: Convert to fraction form
   117,515/256,078 = 256,078/x
3. Step 3: Cross multiply
   117,515x = 256,078 × 256,078
4. Step 4: Simplify right side
   117,515x = 65,575,942,084
5. Step 5: Solve for x
   x = 65,575,942,084/117,515
6. Step 6: Final answer
   x = 558,021.89