Finding the Fourth Proportional to 2,989.78, 4,477.71 and 2,885.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,989.78 : 4,477.71 = 2,885.96 : x
2. Step 2: Convert to fraction form
   2,989.78/4,477.71 = 2,885.96/x
3. Step 3: Cross multiply
   2,989.78x = 4,477.71 × 2,885.96
4. Step 4: Simplify right side
   2,989.78x = 12,922,513.97
5. Step 5: Solve for x
   x = 12,922,513.97/2,989.78
6. Step 6: Final answer
   x = 4,322.23