Finding the Fourth Proportional to 1,047.89, 1,571.58 and 317.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.89 : 1,571.58 = 317.53 : x
2. Step 2: Convert to fraction form
   1,047.89/1,571.58 = 317.53/x
3. Step 3: Cross multiply
   1,047.89x = 1,571.58 × 317.53
4. Step 4: Simplify right side
   1,047.89x = 499,019.87
5. Step 5: Solve for x
   x = 499,019.87/1,047.89
6. Step 6: Final answer
   x = 476.21