Finding the Fourth Proportional to 9,816.81, 13,555.37 and 9,104.51

Step by Step Solution

1. Step 1: Write the proportion equation
   9,816.81 : 13,555.37 = 9,104.51 : x
2. Step 2: Convert to fraction form
   9,816.81/13,555.37 = 9,104.51/x
3. Step 3: Cross multiply
   9,816.81x = 13,555.37 × 9,104.51
4. Step 4: Simplify right side
   9,816.81x = 123,414,956.70
5. Step 5: Solve for x
   x = 123,414,956.70/9,816.81
6. Step 6: Final answer
   x = 12,571.80