Finding the Fourth Proportional to 1,003.29, 1,504.98 and 386.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.29 : 1,504.98 = 386.79 : x
2. Step 2: Convert to fraction form
   1,003.29/1,504.98 = 386.79/x
3. Step 3: Cross multiply
   1,003.29x = 1,504.98 × 386.79
4. Step 4: Simplify right side
   1,003.29x = 582,111.21
5. Step 5: Solve for x
   x = 582,111.21/1,003.29
6. Step 6: Final answer
   x = 580.20