Finding the Fourth Proportional to 12,086.10, 18,129.33 and 7,435.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,086.10 : 18,129.33 = 7,435.89 : x
2. Step 2: Convert to fraction form
   12,086.10/18,129.33 = 7,435.89/x
3. Step 3: Cross multiply
   12,086.10x = 18,129.33 × 7,435.89
4. Step 4: Simplify right side
   12,086.10x = 134,807,703.65
5. Step 5: Solve for x
   x = 134,807,703.65/12,086.10
6. Step 6: Final answer
   x = 11,153.95