Finding the Fourth Proportional to 2,838.27, 4,255.86 and 988.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,838.27 : 4,255.86 = 988.89 : x
2. Step 2: Convert to fraction form
   2,838.27/4,255.86 = 988.89/x
3. Step 3: Cross multiply
   2,838.27x = 4,255.86 × 988.89
4. Step 4: Simplify right side
   2,838.27x = 4,208,575.72
5. Step 5: Solve for x
   x = 4,208,575.72/2,838.27
6. Step 6: Final answer
   x = 1,482.80