Finding the Third Proportional to 317,565 and 491,499.50

Step by Step Solution

1. Step 1: Write the proportion equation
   317,565 : 491,499.50 = 491,499.50 : x
2. Step 2: Convert to fraction form
   317,565/491,499.50 = 491,499.50/x
3. Step 3: Cross multiply
   317,565x = 491,499.50 × 491,499.50
4. Step 4: Simplify right side
   317,565x = 241,571,758,500.25
5. Step 5: Solve for x
   x = 241,571,758,500.25/317,565
6. Step 6: Final answer
   x = 760,700.20