Finding the Fourth Proportional to 1,002.47, 1,503.18 and 386.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.47 : 1,503.18 = 386.06 : x
2. Step 2: Convert to fraction form
   1,002.47/1,503.18 = 386.06/x
3. Step 3: Cross multiply
   1,002.47x = 1,503.18 × 386.06
4. Step 4: Simplify right side
   1,002.47x = 580,310.15
5. Step 5: Solve for x
   x = 580,310.15/1,002.47
6. Step 6: Final answer
   x = 578.88