Finding the Fourth Proportional to 12,310.55, 18,475.47 and 8,588.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,310.55 : 18,475.47 = 8,588.57 : x
2. Step 2: Convert to fraction form
   12,310.55/18,475.47 = 8,588.57/x
3. Step 3: Cross multiply
   12,310.55x = 18,475.47 × 8,588.57
4. Step 4: Simplify right side
   12,310.55x = 158,677,867.38
5. Step 5: Solve for x
   x = 158,677,867.38/12,310.55
6. Step 6: Final answer
   x = 12,889.58