Finding the Third Proportional to 118,857 and 261,039

Step by Step Solution

1. Step 1: Write the proportion equation
   118,857 : 261,039 = 261,039 : x
2. Step 2: Convert to fraction form
   118,857/261,039 = 261,039/x
3. Step 3: Cross multiply
   118,857x = 261,039 × 261,039
4. Step 4: Simplify right side
   118,857x = 68,141,359,521
5. Step 5: Solve for x
   x = 68,141,359,521/118,857
6. Step 6: Final answer
   x = 573,305.40