Finding the Fourth Proportional to 11,879.63, 17,823.69 and 4,089.05

Step by Step Solution

1. Step 1: Write the proportion equation
   11,879.63 : 17,823.69 = 4,089.05 : x
2. Step 2: Convert to fraction form
   11,879.63/17,823.69 = 4,089.05/x
3. Step 3: Cross multiply
   11,879.63x = 17,823.69 × 4,089.05
4. Step 4: Simplify right side
   11,879.63x = 72,881,870.48
5. Step 5: Solve for x
   x = 72,881,870.48/11,879.63
6. Step 6: Final answer
   x = 6,135.03