Finding the Fourth Proportional to 13,131.98, 18,120.48 and 7,827.38

Step by Step Solution

1. Step 1: Write the proportion equation
   13,131.98 : 18,120.48 = 7,827.38 : x
2. Step 2: Convert to fraction form
   13,131.98/18,120.48 = 7,827.38/x
3. Step 3: Cross multiply
   13,131.98x = 18,120.48 × 7,827.38
4. Step 4: Simplify right side
   13,131.98x = 141,835,882.74
5. Step 5: Solve for x
   x = 141,835,882.74/13,131.98
6. Step 6: Final answer
   x = 10,800.80