Finding the Fourth Proportional to 13,149.48, 18,145.82 and 7,841.55

Step by Step Solution

1. Step 1: Write the proportion equation
   13,149.48 : 18,145.82 = 7,841.55 : x
2. Step 2: Convert to fraction form
   13,149.48/18,145.82 = 7,841.55/x
3. Step 3: Cross multiply
   13,149.48x = 18,145.82 × 7,841.55
4. Step 4: Simplify right side
   13,149.48x = 142,291,374.42
5. Step 5: Solve for x
   x = 142,291,374.42/13,149.48
6. Step 6: Final answer
   x = 10,821.06