Finding the Fourth Proportional to 2,719.52, 4,077.12 and 987.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,719.52 : 4,077.12 = 987.20 : x
2. Step 2: Convert to fraction form
   2,719.52/4,077.12 = 987.20/x
3. Step 3: Cross multiply
   2,719.52x = 4,077.12 × 987.20
4. Step 4: Simplify right side
   2,719.52x = 4,024,932.86
5. Step 5: Solve for x
   x = 4,024,932.86/2,719.52
6. Step 6: Final answer
   x = 1,480.02