Finding the Fourth Proportional to 13,111.56, 18,094.01 and 7,143.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,111.56 : 18,094.01 = 7,143.28 : x
2. Step 2: Convert to fraction form
   13,111.56/18,094.01 = 7,143.28/x
3. Step 3: Cross multiply
   13,111.56x = 18,094.01 × 7,143.28
4. Step 4: Simplify right side
   13,111.56x = 129,250,579.75
5. Step 5: Solve for x
   x = 129,250,579.75/13,111.56
6. Step 6: Final answer
   x = 9,857.76