Finding the Fourth Proportional to 5,817.09, 8,758.39 and 5,128.18

Step by Step Solution

1. Step 1: Write the proportion equation
   5,817.09 : 8,758.39 = 5,128.18 : x
2. Step 2: Convert to fraction form
   5,817.09/8,758.39 = 5,128.18/x
3. Step 3: Cross multiply
   5,817.09x = 8,758.39 × 5,128.18
4. Step 4: Simplify right side
   5,817.09x = 44,914,600.43
5. Step 5: Solve for x
   x = 44,914,600.43/5,817.09
6. Step 6: Final answer
   x = 7,721.15