Finding the Fourth Proportional to 1,485.05, 2,227.59 and 389.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,485.05 : 2,227.59 = 389.52 : x
2. Step 2: Convert to fraction form
   1,485.05/2,227.59 = 389.52/x
3. Step 3: Cross multiply
   1,485.05x = 2,227.59 × 389.52
4. Step 4: Simplify right side
   1,485.05x = 867,690.86
5. Step 5: Solve for x
   x = 867,690.86/1,485.05
6. Step 6: Final answer
   x = 584.29