Finding the Fourth Proportional to 10,991.89, 16,465.86 and 6,606.96

Step by Step Solution

1. Step 1: Write the proportion equation
   10,991.89 : 16,465.86 = 6,606.96 : x
2. Step 2: Convert to fraction form
   10,991.89/16,465.86 = 6,606.96/x
3. Step 3: Cross multiply
   10,991.89x = 16,465.86 × 6,606.96
4. Step 4: Simplify right side
   10,991.89x = 108,789,278.39
5. Step 5: Solve for x
   x = 108,789,278.39/10,991.89
6. Step 6: Final answer
   x = 9,897.23