Finding the Third Proportional to 439,407 and 659,112.75

Step by Step Solution

1. Step 1: Write the proportion equation
   439,407 : 659,112.75 = 659,112.75 : x
2. Step 2: Convert to fraction form
   439,407/659,112.75 = 659,112.75/x
3. Step 3: Cross multiply
   439,407x = 659,112.75 × 659,112.75
4. Step 4: Simplify right side
   439,407x = 434,429,617,212.56
5. Step 5: Solve for x
   x = 434,429,617,212.56/439,407
6. Step 6: Final answer
   x = 988,672.50