Finding the Third Proportional to 288,892.50 and 617,848.50

Step by Step Solution

1. Step 1: Write the proportion equation
   288,892.50 : 617,848.50 = 617,848.50 : x
2. Step 2: Convert to fraction form
   288,892.50/617,848.50 = 617,848.50/x
3. Step 3: Cross multiply
   288,892.50x = 617,848.50 × 617,848.50
4. Step 4: Simplify right side
   288,892.50x = 381,736,768,952.25
5. Step 5: Solve for x
   x = 381,736,768,952.25/288,892.50
6. Step 6: Final answer
   x = 1,321,379.99