Finding the Fourth Proportional to 1,002.89, 1,504.06 and 386.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.89 : 1,504.06 = 386.62 : x
2. Step 2: Convert to fraction form
   1,002.89/1,504.06 = 386.62/x
3. Step 3: Cross multiply
   1,002.89x = 1,504.06 × 386.62
4. Step 4: Simplify right side
   1,002.89x = 581,499.68
5. Step 5: Solve for x
   x = 581,499.68/1,002.89
6. Step 6: Final answer
   x = 579.82