Finding the Third Proportional to 122,139 and 269,128

Step by Step Solution

1. Step 1: Write the proportion equation
   122,139 : 269,128 = 269,128 : x
2. Step 2: Convert to fraction form
   122,139/269,128 = 269,128/x
3. Step 3: Cross multiply
   122,139x = 269,128 × 269,128
4. Step 4: Simplify right side
   122,139x = 72,429,880,384
5. Step 5: Solve for x
   x = 72,429,880,384/122,139
6. Step 6: Final answer
   x = 593,011.90