Finding the Third Proportional to 317,406 and 430,591.50

Step by Step Solution

1. Step 1: Write the proportion equation
   317,406 : 430,591.50 = 430,591.50 : x
2. Step 2: Convert to fraction form
   317,406/430,591.50 = 430,591.50/x
3. Step 3: Cross multiply
   317,406x = 430,591.50 × 430,591.50
4. Step 4: Simplify right side
   317,406x = 185,409,039,872.25
5. Step 5: Solve for x
   x = 185,409,039,872.25/317,406
6. Step 6: Final answer
   x = 584,138.42