Finding the Third Proportional to 178,689 and 276,430.50

Step by Step Solution

1. Step 1: Write the proportion equation
   178,689 : 276,430.50 = 276,430.50 : x
2. Step 2: Convert to fraction form
   178,689/276,430.50 = 276,430.50/x
3. Step 3: Cross multiply
   178,689x = 276,430.50 × 276,430.50
4. Step 4: Simplify right side
   178,689x = 76,413,821,330.25
5. Step 5: Solve for x
   x = 76,413,821,330.25/178,689
6. Step 6: Final answer
   x = 427,635.84