Finding the Fourth Proportional to 3,178.72, 4,768.59 and 986.94

Step by Step Solution

1. Step 1: Write the proportion equation
   3,178.72 : 4,768.59 = 986.94 : x
2. Step 2: Convert to fraction form
   3,178.72/4,768.59 = 986.94/x
3. Step 3: Cross multiply
   3,178.72x = 4,768.59 × 986.94
4. Step 4: Simplify right side
   3,178.72x = 4,706,288.37
5. Step 5: Solve for x
   x = 4,706,288.37/3,178.72
6. Step 6: Final answer
   x = 1,480.56