Finding the Third Proportional to 128,814 and 279,064.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,814 : 279,064.50 = 279,064.50 : x
2. Step 2: Convert to fraction form
   128,814/279,064.50 = 279,064.50/x
3. Step 3: Cross multiply
   128,814x = 279,064.50 × 279,064.50
4. Step 4: Simplify right side
   128,814x = 77,876,995,160.25
5. Step 5: Solve for x
   x = 77,876,995,160.25/128,814
6. Step 6: Final answer
   x = 604,569.34