Finding the Fourth Proportional to 8,515.63, 12,778.05 and 3,588.71

Step by Step Solution

1. Step 1: Write the proportion equation
   8,515.63 : 12,778.05 = 3,588.71 : x
2. Step 2: Convert to fraction form
   8,515.63/12,778.05 = 3,588.71/x
3. Step 3: Cross multiply
   8,515.63x = 12,778.05 × 3,588.71
4. Step 4: Simplify right side
   8,515.63x = 45,856,665.38
5. Step 5: Solve for x
   x = 45,856,665.38/8,515.63
6. Step 6: Final answer
   x = 5,385.00