Finding the Third Proportional to 128,511 and 279,076.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,511 : 279,076.50 = 279,076.50 : x
2. Step 2: Convert to fraction form
   128,511/279,076.50 = 279,076.50/x
3. Step 3: Cross multiply
   128,511x = 279,076.50 × 279,076.50
4. Step 4: Simplify right side
   128,511x = 77,883,692,852.25
5. Step 5: Solve for x
   x = 77,883,692,852.25/128,511
6. Step 6: Final answer
   x = 606,046.90