Finding the Fourth Proportional to 2,011.78, 3,017.91 and 985.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,011.78 : 3,017.91 = 985.54 : x
2. Step 2: Convert to fraction form
   2,011.78/3,017.91 = 985.54/x
3. Step 3: Cross multiply
   2,011.78x = 3,017.91 × 985.54
4. Step 4: Simplify right side
   2,011.78x = 2,974,271.02
5. Step 5: Solve for x
   x = 2,974,271.02/2,011.78
6. Step 6: Final answer
   x = 1,478.43