Finding the Fourth Proportional to 2,742.57, 4,112.83 and 987.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,742.57 : 4,112.83 = 987.10 : x
2. Step 2: Convert to fraction form
   2,742.57/4,112.83 = 987.10/x
3. Step 3: Cross multiply
   2,742.57x = 4,112.83 × 987.10
4. Step 4: Simplify right side
   2,742.57x = 4,059,765.44
5. Step 5: Solve for x
   x = 4,059,765.44/2,742.57
6. Step 6: Final answer
   x = 1,480.28