Finding the Third Proportional to 319,415 and 479,130.50

Step by Step Solution

1. Step 1: Write the proportion equation
   319,415 : 479,130.50 = 479,130.50 : x
2. Step 2: Convert to fraction form
   319,415/479,130.50 = 479,130.50/x
3. Step 3: Cross multiply
   319,415x = 479,130.50 × 479,130.50
4. Step 4: Simplify right side
   319,415x = 229,566,036,030.25
5. Step 5: Solve for x
   x = 229,566,036,030.25/319,415
6. Step 6: Final answer
   x = 718,707.75