Finding the Fourth Proportional to 12,085.29, 18,125.78 and 7,689.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,085.29 : 18,125.78 = 7,689.69 : x
2. Step 2: Convert to fraction form
   12,085.29/18,125.78 = 7,689.69/x
3. Step 3: Cross multiply
   12,085.29x = 18,125.78 × 7,689.69
4. Step 4: Simplify right side
   12,085.29x = 139,381,590.76
5. Step 5: Solve for x
   x = 139,381,590.76/12,085.29
6. Step 6: Final answer
   x = 11,533.16