Finding the Fourth Proportional to 1,047.16, 1,571.35 and 389.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.16 : 1,571.35 = 389.50 : x
2. Step 2: Convert to fraction form
   1,047.16/1,571.35 = 389.50/x
3. Step 3: Cross multiply
   1,047.16x = 1,571.35 × 389.50
4. Step 4: Simplify right side
   1,047.16x = 612,040.83
5. Step 5: Solve for x
   x = 612,040.83/1,047.16
6. Step 6: Final answer
   x = 584.48