Finding the Third Proportional to 290,277 and 439,789.50

Step by Step Solution

1. Step 1: Write the proportion equation
   290,277 : 439,789.50 = 439,789.50 : x
2. Step 2: Convert to fraction form
   290,277/439,789.50 = 439,789.50/x
3. Step 3: Cross multiply
   290,277x = 439,789.50 × 439,789.50
4. Step 4: Simplify right side
   290,277x = 193,414,804,310.25
5. Step 5: Solve for x
   x = 193,414,804,310.25/290,277
6. Step 6: Final answer
   x = 666,311.16