Finding the Third Proportional to 200,260.13 and 309,978.56

Step by Step Solution

1. Step 1: Write the proportion equation
   200,260.13 : 309,978.56 = 309,978.56 : x
2. Step 2: Convert to fraction form
   200,260.13/309,978.56 = 309,978.56/x
3. Step 3: Cross multiply
   200,260.13x = 309,978.56 × 309,978.56
4. Step 4: Simplify right side
   200,260.13x = 96,086,709,209.57
5. Step 5: Solve for x
   x = 96,086,709,209.57/200,260.13
6. Step 6: Final answer
   x = 479,809.49