Finding the Fourth Proportional to 13,123.62, 18,105.15 and 9,147

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.62 : 18,105.15 = 9,147 : x
2. Step 2: Convert to fraction form
   13,123.62/18,105.15 = 9,147/x
3. Step 3: Cross multiply
   13,123.62x = 18,105.15 × 9,147
4. Step 4: Simplify right side
   13,123.62x = 165,607,807.05
5. Step 5: Solve for x
   x = 165,607,807.05/13,123.62
6. Step 6: Final answer
   x = 12,619.06