Finding the Fourth Proportional to 1,038.16, 1,556.56 and 388.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,038.16 : 1,556.56 = 388.52 : x
2. Step 2: Convert to fraction form
   1,038.16/1,556.56 = 388.52/x
3. Step 3: Cross multiply
   1,038.16x = 1,556.56 × 388.52
4. Step 4: Simplify right side
   1,038.16x = 604,754.69
5. Step 5: Solve for x
   x = 604,754.69/1,038.16
6. Step 6: Final answer
   x = 582.53