Finding the Fourth Proportional to 2,412.72, 3,619.80 and 1,386

Step by Step Solution

1. Step 1: Write the proportion equation
   2,412.72 : 3,619.80 = 1,386 : x
2. Step 2: Convert to fraction form
   2,412.72/3,619.80 = 1,386/x
3. Step 3: Cross multiply
   2,412.72x = 3,619.80 × 1,386
4. Step 4: Simplify right side
   2,412.72x = 5,017,042.80
5. Step 5: Solve for x
   x = 5,017,042.80/2,412.72
6. Step 6: Final answer
   x = 2,079.41