Finding the Third Proportional to 127,989.50 and 279,306

Step by Step Solution

1. Step 1: Write the proportion equation
   127,989.50 : 279,306 = 279,306 : x
2. Step 2: Convert to fraction form
   127,989.50/279,306 = 279,306/x
3. Step 3: Cross multiply
   127,989.50x = 279,306 × 279,306
4. Step 4: Simplify right side
   127,989.50x = 78,011,841,636
5. Step 5: Solve for x
   x = 78,011,841,636/127,989.50
6. Step 6: Final answer
   x = 609,517.51