Finding the Fourth Proportional to 12,076.80, 18,123.30 and 7,141.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,076.80 : 18,123.30 = 7,141.20 : x
2. Step 2: Convert to fraction form
   12,076.80/18,123.30 = 7,141.20/x
3. Step 3: Cross multiply
   12,076.80x = 18,123.30 × 7,141.20
4. Step 4: Simplify right side
   12,076.80x = 129,422,109.96
5. Step 5: Solve for x
   x = 129,422,109.96/12,076.80
6. Step 6: Final answer
   x = 10,716.59