Finding the Fourth Proportional to 12,086.72, 18,123.54 and 4,689.19

Step by Step Solution

1. Step 1: Write the proportion equation
   12,086.72 : 18,123.54 = 4,689.19 : x
2. Step 2: Convert to fraction form
   12,086.72/18,123.54 = 4,689.19/x
3. Step 3: Cross multiply
   12,086.72x = 18,123.54 × 4,689.19
4. Step 4: Simplify right side
   12,086.72x = 84,984,631.91
5. Step 5: Solve for x
   x = 84,984,631.91/12,086.72
6. Step 6: Final answer
   x = 7,031.24