Finding the Third Proportional to 276,817.50 and 434,443.50

Step by Step Solution

1. Step 1: Write the proportion equation
   276,817.50 : 434,443.50 = 434,443.50 : x
2. Step 2: Convert to fraction form
   276,817.50/434,443.50 = 434,443.50/x
3. Step 3: Cross multiply
   276,817.50x = 434,443.50 × 434,443.50
4. Step 4: Simplify right side
   276,817.50x = 188,741,154,692.25
5. Step 5: Solve for x
   x = 188,741,154,692.25/276,817.50
6. Step 6: Final answer
   x = 681,825.23