Finding the Fourth Proportional to 1,004.50, 1,505.82 and 388.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,004.50 : 1,505.82 = 388.18 : x
2. Step 2: Convert to fraction form
   1,004.50/1,505.82 = 388.18/x
3. Step 3: Cross multiply
   1,004.50x = 1,505.82 × 388.18
4. Step 4: Simplify right side
   1,004.50x = 584,529.21
5. Step 5: Solve for x
   x = 584,529.21/1,004.50
6. Step 6: Final answer
   x = 581.91