Finding the Fourth Proportional to 10,989.81, 16,472.66 and 7,240.05

Step by Step Solution

1. Step 1: Write the proportion equation
   10,989.81 : 16,472.66 = 7,240.05 : x
2. Step 2: Convert to fraction form
   10,989.81/16,472.66 = 7,240.05/x
3. Step 3: Cross multiply
   10,989.81x = 16,472.66 × 7,240.05
4. Step 4: Simplify right side
   10,989.81x = 119,262,845.83
5. Step 5: Solve for x
   x = 119,262,845.83/10,989.81
6. Step 6: Final answer
   x = 10,852.13