Finding the Fourth Proportional to 11,789.10, 17,680.89 and 5,211.69

Step by Step Solution

1. Step 1: Write the proportion equation
   11,789.10 : 17,680.89 = 5,211.69 : x
2. Step 2: Convert to fraction form
   11,789.10/17,680.89 = 5,211.69/x
3. Step 3: Cross multiply
   11,789.10x = 17,680.89 × 5,211.69
4. Step 4: Simplify right side
   11,789.10x = 92,147,317.60
5. Step 5: Solve for x
   x = 92,147,317.60/11,789.10
6. Step 6: Final answer
   x = 7,816.31