Finding the Fourth Proportional to 12,085.48, 18,128.70 and 5,757.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,085.48 : 18,128.70 = 5,757.10 : x
2. Step 2: Convert to fraction form
   12,085.48/18,128.70 = 5,757.10/x
3. Step 3: Cross multiply
   12,085.48x = 18,128.70 × 5,757.10
4. Step 4: Simplify right side
   12,085.48x = 104,368,753.16
5. Step 5: Solve for x
   x = 104,368,753.16/12,085.48
6. Step 6: Final answer
   x = 8,635.88