Finding the Third Proportional to 123,039 and 268,312.50

Step by Step Solution

1. Step 1: Write the proportion equation
   123,039 : 268,312.50 = 268,312.50 : x
2. Step 2: Convert to fraction form
   123,039/268,312.50 = 268,312.50/x
3. Step 3: Cross multiply
   123,039x = 268,312.50 × 268,312.50
4. Step 4: Simplify right side
   123,039x = 71,991,597,656.25
5. Step 5: Solve for x
   x = 71,991,597,656.25/123,039
6. Step 6: Final answer
   x = 585,112.02