Finding the Fourth Proportional to 13,219.47, 18,243.59 and 7,843.55

Step by Step Solution

1. Step 1: Write the proportion equation
   13,219.47 : 18,243.59 = 7,843.55 : x
2. Step 2: Convert to fraction form
   13,219.47/18,243.59 = 7,843.55/x
3. Step 3: Cross multiply
   13,219.47x = 18,243.59 × 7,843.55
4. Step 4: Simplify right side
   13,219.47x = 143,094,379.91
5. Step 5: Solve for x
   x = 143,094,379.91/13,219.47
6. Step 6: Final answer
   x = 10,824.52