Finding the Third Proportional to 118,242 and 256,158

Step by Step Solution

1. Step 1: Write the proportion equation
   118,242 : 256,158 = 256,158 : x
2. Step 2: Convert to fraction form
   118,242/256,158 = 256,158/x
3. Step 3: Cross multiply
   118,242x = 256,158 × 256,158
4. Step 4: Simplify right side
   118,242x = 65,616,920,964
5. Step 5: Solve for x
   x = 65,616,920,964/118,242
6. Step 6: Final answer
   x = 554,937.51