Finding the Fourth Proportional to 8,064.39, 12,091.88 and 3,128.27

Step by Step Solution

1. Step 1: Write the proportion equation
   8,064.39 : 12,091.88 = 3,128.27 : x
2. Step 2: Convert to fraction form
   8,064.39/12,091.88 = 3,128.27/x
3. Step 3: Cross multiply
   8,064.39x = 12,091.88 × 3,128.27
4. Step 4: Simplify right side
   8,064.39x = 37,826,612.81
5. Step 5: Solve for x
   x = 37,826,612.81/8,064.39
6. Step 6: Final answer
   x = 4,690.57