Finding the Fourth Proportional to 3,178.52, 4,768.56 and 987.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,178.52 : 4,768.56 = 987.20 : x
2. Step 2: Convert to fraction form
   3,178.52/4,768.56 = 987.20/x
3. Step 3: Cross multiply
   3,178.52x = 4,768.56 × 987.20
4. Step 4: Simplify right side
   3,178.52x = 4,707,522.43
5. Step 5: Solve for x
   x = 4,707,522.43/3,178.52
6. Step 6: Final answer
   x = 1,481.04