Finding the Fourth Proportional to 1,116.53, 1,674.18 and 386.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.53 : 1,674.18 = 386.04 : x
2. Step 2: Convert to fraction form
   1,116.53/1,674.18 = 386.04/x
3. Step 3: Cross multiply
   1,116.53x = 1,674.18 × 386.04
4. Step 4: Simplify right side
   1,116.53x = 646,300.45
5. Step 5: Solve for x
   x = 646,300.45/1,116.53
6. Step 6: Final answer
   x = 578.85