Finding the Fourth Proportional to 13,138.30, 18,131.34 and 7,833.61

Step by Step Solution

1. Step 1: Write the proportion equation
   13,138.30 : 18,131.34 = 7,833.61 : x
2. Step 2: Convert to fraction form
   13,138.30/18,131.34 = 7,833.61/x
3. Step 3: Cross multiply
   13,138.30x = 18,131.34 × 7,833.61
4. Step 4: Simplify right side
   13,138.30x = 142,033,846.34
5. Step 5: Solve for x
   x = 142,033,846.34/13,138.30
6. Step 6: Final answer
   x = 10,810.67