Finding the Third Proportional to 128,215 and 279,006.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,215 : 279,006.50 = 279,006.50 : x
2. Step 2: Convert to fraction form
   128,215/279,006.50 = 279,006.50/x
3. Step 3: Cross multiply
   128,215x = 279,006.50 × 279,006.50
4. Step 4: Simplify right side
   128,215x = 77,844,627,042.25
5. Step 5: Solve for x
   x = 77,844,627,042.25/128,215
6. Step 6: Final answer
   x = 607,141.34