Finding the Fourth Proportional to 12,728.15, 19,084.55 and 5,706.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,728.15 : 19,084.55 = 5,706.89 : x
2. Step 2: Convert to fraction form
   12,728.15/19,084.55 = 5,706.89/x
3. Step 3: Cross multiply
   12,728.15x = 19,084.55 × 5,706.89
4. Step 4: Simplify right side
   12,728.15x = 108,913,489.53
5. Step 5: Solve for x
   x = 108,913,489.53/12,728.15
6. Step 6: Final answer
   x = 8,556.90