Finding the Fourth Proportional to 13,123.21, 18,111.45 and 8,086.36

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.21 : 18,111.45 = 8,086.36 : x
2. Step 2: Convert to fraction form
   13,123.21/18,111.45 = 8,086.36/x
3. Step 3: Cross multiply
   13,123.21x = 18,111.45 × 8,086.36
4. Step 4: Simplify right side
   13,123.21x = 146,455,704.82
5. Step 5: Solve for x
   x = 146,455,704.82/13,123.21
6. Step 6: Final answer
   x = 11,160.05