Finding the Fourth Proportional to 12,057.72, 18,085.14 and 5,134.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,057.72 : 18,085.14 = 5,134.20 : x
2. Step 2: Convert to fraction form
   12,057.72/18,085.14 = 5,134.20/x
3. Step 3: Cross multiply
   12,057.72x = 18,085.14 × 5,134.20
4. Step 4: Simplify right side
   12,057.72x = 92,852,725.79
5. Step 5: Solve for x
   x = 92,852,725.79/12,057.72
6. Step 6: Final answer
   x = 7,700.69