Finding the Third Proportional to 309,373.50 and 492,279

Step by Step Solution

1. Step 1: Write the proportion equation
   309,373.50 : 492,279 = 492,279 : x
2. Step 2: Convert to fraction form
   309,373.50/492,279 = 492,279/x
3. Step 3: Cross multiply
   309,373.50x = 492,279 × 492,279
4. Step 4: Simplify right side
   309,373.50x = 242,338,613,841
5. Step 5: Solve for x
   x = 242,338,613,841/309,373.50
6. Step 6: Final answer
   x = 783,320.53