Finding the Fourth Proportional to 11,665.50, 16,092.84 and 7,889.99

Step by Step Solution

1. Step 1: Write the proportion equation
   11,665.50 : 16,092.84 = 7,889.99 : x
2. Step 2: Convert to fraction form
   11,665.50/16,092.84 = 7,889.99/x
3. Step 3: Cross multiply
   11,665.50x = 16,092.84 × 7,889.99
4. Step 4: Simplify right side
   11,665.50x = 126,972,266.21
5. Step 5: Solve for x
   x = 126,972,266.21/11,665.50
6. Step 6: Final answer
   x = 10,884.43