Finding the Third Proportional to 315,478.50 and 476,980.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,478.50 : 476,980.50 = 476,980.50 : x
2. Step 2: Convert to fraction form
   315,478.50/476,980.50 = 476,980.50/x
3. Step 3: Cross multiply
   315,478.50x = 476,980.50 × 476,980.50
4. Step 4: Simplify right side
   315,478.50x = 227,510,397,380.25
5. Step 5: Solve for x
   x = 227,510,397,380.25/315,478.50
6. Step 6: Final answer
   x = 721,159.75