Finding the Fourth Proportional to 12,089.34, 18,133.71 and 7,123.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,089.34 : 18,133.71 = 7,123.21 : x
2. Step 2: Convert to fraction form
   12,089.34/18,133.71 = 7,123.21/x
3. Step 3: Cross multiply
   12,089.34x = 18,133.71 × 7,123.21
4. Step 4: Simplify right side
   12,089.34x = 129,170,224.41
5. Step 5: Solve for x
   x = 129,170,224.41/12,089.34
6. Step 6: Final answer
   x = 10,684.64