Finding the Fourth Proportional to 13,111.89, 18,094.61 and 7,143.55

Step by Step Solution

1. Step 1: Write the proportion equation
   13,111.89 : 18,094.61 = 7,143.55 : x
2. Step 2: Convert to fraction form
   13,111.89/18,094.61 = 7,143.55/x
3. Step 3: Cross multiply
   13,111.89x = 18,094.61 × 7,143.55
4. Step 4: Simplify right side
   13,111.89x = 129,259,751.27
5. Step 5: Solve for x
   x = 129,259,751.27/13,111.89
6. Step 6: Final answer
   x = 9,858.21