Finding the Fourth Proportional to 1,047.93, 1,572.15 and 389.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.93 : 1,572.15 = 389.83 : x
2. Step 2: Convert to fraction form
   1,047.93/1,572.15 = 389.83/x
3. Step 3: Cross multiply
   1,047.93x = 1,572.15 × 389.83
4. Step 4: Simplify right side
   1,047.93x = 612,876.88
5. Step 5: Solve for x
   x = 612,876.88/1,047.93
6. Step 6: Final answer
   x = 584.84