Finding the Fourth Proportional to 1,116.84, 1,674.56 and 386.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.84 : 1,674.56 = 386.47 : x
2. Step 2: Convert to fraction form
   1,116.84/1,674.56 = 386.47/x
3. Step 3: Cross multiply
   1,116.84x = 1,674.56 × 386.47
4. Step 4: Simplify right side
   1,116.84x = 647,168.09
5. Step 5: Solve for x
   x = 647,168.09/1,116.84
6. Step 6: Final answer
   x = 579.46