Finding the Fourth Proportional to 13,131, 18,120.60 and 7,826.04

Step by Step Solution

1. Step 1: Write the proportion equation
   13,131 : 18,120.60 = 7,826.04 : x
2. Step 2: Convert to fraction form
   13,131/18,120.60 = 7,826.04/x
3. Step 3: Cross multiply
   13,131x = 18,120.60 × 7,826.04
4. Step 4: Simplify right side
   13,131x = 141,812,540.42
5. Step 5: Solve for x
   x = 141,812,540.42/13,131
6. Step 6: Final answer
   x = 10,799.83