Finding the Fourth Proportional to 2,742.20, 4,112.27 and 986.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,742.20 : 4,112.27 = 986.72 : x
2. Step 2: Convert to fraction form
   2,742.20/4,112.27 = 986.72/x
3. Step 3: Cross multiply
   2,742.20x = 4,112.27 × 986.72
4. Step 4: Simplify right side
   2,742.20x = 4,057,671.80
5. Step 5: Solve for x
   x = 4,057,671.80/2,742.20
6. Step 6: Final answer
   x = 1,479.72