Finding the Fourth Proportional to 11,789.20, 17,665.98 and 7,886.62

Step by Step Solution

1. Step 1: Write the proportion equation
   11,789.20 : 17,665.98 = 7,886.62 : x
2. Step 2: Convert to fraction form
   11,789.20/17,665.98 = 7,886.62/x
3. Step 3: Cross multiply
   11,789.20x = 17,665.98 × 7,886.62
4. Step 4: Simplify right side
   11,789.20x = 139,324,871.19
5. Step 5: Solve for x
   x = 139,324,871.19/11,789.20
6. Step 6: Final answer
   x = 11,818.01