Finding the Third Proportional to 407,619 and 587,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   407,619 : 587,128.50 = 587,128.50 : x
2. Step 2: Convert to fraction form
   407,619/587,128.50 = 587,128.50/x
3. Step 3: Cross multiply
   407,619x = 587,128.50 × 587,128.50
4. Step 4: Simplify right side
   407,619x = 344,719,875,512.25
5. Step 5: Solve for x
   x = 344,719,875,512.25/407,619
6. Step 6: Final answer
   x = 845,691.38