Finding the Fourth Proportional to 2,084.52, 3,128.31 and 988.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,084.52 : 3,128.31 = 988.88 : x
2. Step 2: Convert to fraction form
   2,084.52/3,128.31 = 988.88/x
3. Step 3: Cross multiply
   2,084.52x = 3,128.31 × 988.88
4. Step 4: Simplify right side
   2,084.52x = 3,093,523.19
5. Step 5: Solve for x
   x = 3,093,523.19/2,084.52
6. Step 6: Final answer
   x = 1,484.05