Finding the Third Proportional to 117,218 and 256,900

Step by Step Solution

1. Step 1: Write the proportion equation
   117,218 : 256,900 = 256,900 : x
2. Step 2: Convert to fraction form
   117,218/256,900 = 256,900/x
3. Step 3: Cross multiply
   117,218x = 256,900 × 256,900
4. Step 4: Simplify right side
   117,218x = 65,997,610,000
5. Step 5: Solve for x
   x = 65,997,610,000/117,218
6. Step 6: Final answer
   x = 563,033.07