Finding the Third Proportional to 128,123 and 275,928.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,123 : 275,928.50 = 275,928.50 : x
2. Step 2: Convert to fraction form
   128,123/275,928.50 = 275,928.50/x
3. Step 3: Cross multiply
   128,123x = 275,928.50 × 275,928.50
4. Step 4: Simplify right side
   128,123x = 76,136,537,112.25
5. Step 5: Solve for x
   x = 76,136,537,112.25/128,123
6. Step 6: Final answer
   x = 594,245.66