Finding the Fourth Proportional to 2,759.50, 3,809.52 and 2,128.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,759.50 : 3,809.52 = 2,128.61 : x
2. Step 2: Convert to fraction form
   2,759.50/3,809.52 = 2,128.61/x
3. Step 3: Cross multiply
   2,759.50x = 3,809.52 × 2,128.61
4. Step 4: Simplify right side
   2,759.50x = 8,108,990.32
5. Step 5: Solve for x
   x = 8,108,990.32/2,759.50
6. Step 6: Final answer
   x = 2,938.57