Finding the Fourth Proportional to 1,047.27, 1,570.94 and 389.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.27 : 1,570.94 = 389.32 : x
2. Step 2: Convert to fraction form
   1,047.27/1,570.94 = 389.32/x
3. Step 3: Cross multiply
   1,047.27x = 1,570.94 × 389.32
4. Step 4: Simplify right side
   1,047.27x = 611,590.51
5. Step 5: Solve for x
   x = 611,590.51/1,047.27
6. Step 6: Final answer
   x = 583.99