Finding the Fourth Proportional to 1,037.31, 1,556.45 and 388.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,037.31 : 1,556.45 = 388.50 : x
2. Step 2: Convert to fraction form
   1,037.31/1,556.45 = 388.50/x
3. Step 3: Cross multiply
   1,037.31x = 1,556.45 × 388.50
4. Step 4: Simplify right side
   1,037.31x = 604,680.83
5. Step 5: Solve for x
   x = 604,680.83/1,037.31
6. Step 6: Final answer
   x = 582.93