Finding the Fourth Proportional to 11,105.30, 15,323.84 and 7,131.80

Step by Step Solution

1. Step 1: Write the proportion equation
   11,105.30 : 15,323.84 = 7,131.80 : x
2. Step 2: Convert to fraction form
   11,105.30/15,323.84 = 7,131.80/x
3. Step 3: Cross multiply
   11,105.30x = 15,323.84 × 7,131.80
4. Step 4: Simplify right side
   11,105.30x = 109,286,449.83
5. Step 5: Solve for x
   x = 109,286,449.83/11,105.30
6. Step 6: Final answer
   x = 9,840.93