Finding the Third Proportional to 128,344.50 and 279,065.25

Step by Step Solution

1. Step 1: Write the proportion equation
   128,344.50 : 279,065.25 = 279,065.25 : x
2. Step 2: Convert to fraction form
   128,344.50/279,065.25 = 279,065.25/x
3. Step 3: Cross multiply
   128,344.50x = 279,065.25 × 279,065.25
4. Step 4: Simplify right side
   128,344.50x = 77,877,413,757.56
5. Step 5: Solve for x
   x = 77,877,413,757.56/128,344.50
6. Step 6: Final answer
   x = 606,784.19