Finding the Third Proportional to 583,078.50 and 899,518.50

Step by Step Solution

1. Step 1: Write the proportion equation
   583,078.50 : 899,518.50 = 899,518.50 : x
2. Step 2: Convert to fraction form
   583,078.50/899,518.50 = 899,518.50/x
3. Step 3: Cross multiply
   583,078.50x = 899,518.50 × 899,518.50
4. Step 4: Simplify right side
   583,078.50x = 809,133,531,842.25
5. Step 5: Solve for x
   x = 809,133,531,842.25/583,078.50
6. Step 6: Final answer
   x = 1,387,692.28