Finding the Fourth Proportional to 2,838.72, 4,256.67 and 989.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,838.72 : 4,256.67 = 989.94 : x
2. Step 2: Convert to fraction form
   2,838.72/4,256.67 = 989.94/x
3. Step 3: Cross multiply
   2,838.72x = 4,256.67 × 989.94
4. Step 4: Simplify right side
   2,838.72x = 4,213,847.90
5. Step 5: Solve for x
   x = 4,213,847.90/2,838.72
6. Step 6: Final answer
   x = 1,484.42