Finding the Fourth Proportional to 1,017.98, 1,527.20 and 315.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.98 : 1,527.20 = 315.30 : x
2. Step 2: Convert to fraction form
   1,017.98/1,527.20 = 315.30/x
3. Step 3: Cross multiply
   1,017.98x = 1,527.20 × 315.30
4. Step 4: Simplify right side
   1,017.98x = 481,526.16
5. Step 5: Solve for x
   x = 481,526.16/1,017.98
6. Step 6: Final answer
   x = 473.02