Finding the Third Proportional to 128,958 and 274,522.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,958 : 274,522.50 = 274,522.50 : x
2. Step 2: Convert to fraction form
   128,958/274,522.50 = 274,522.50/x
3. Step 3: Cross multiply
   128,958x = 274,522.50 × 274,522.50
4. Step 4: Simplify right side
   128,958x = 75,362,603,006.25
5. Step 5: Solve for x
   x = 75,362,603,006.25/128,958
6. Step 6: Final answer
   x = 584,396.49