Finding the Fourth Proportional to 12,091.28, 17,990.61 and 11,789.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,091.28 : 17,990.61 = 11,789.96 : x
2. Step 2: Convert to fraction form
   12,091.28/17,990.61 = 11,789.96/x
3. Step 3: Cross multiply
   12,091.28x = 17,990.61 × 11,789.96
4. Step 4: Simplify right side
   12,091.28x = 212,108,482.32
5. Step 5: Solve for x
   x = 212,108,482.32/12,091.28
6. Step 6: Final answer
   x = 17,542.28