Finding the Third Proportional to 127,988 and 279,267.50

Step by Step Solution

1. Step 1: Write the proportion equation
   127,988 : 279,267.50 = 279,267.50 : x
2. Step 2: Convert to fraction form
   127,988/279,267.50 = 279,267.50/x
3. Step 3: Cross multiply
   127,988x = 279,267.50 × 279,267.50
4. Step 4: Simplify right side
   127,988x = 77,990,336,556.25
5. Step 5: Solve for x
   x = 77,990,336,556.25/127,988
6. Step 6: Final answer
   x = 609,356.63