Finding the Fourth Proportional to 13,146.56, 18,142.16 and 7,178.22

Step by Step Solution

1. Step 1: Write the proportion equation
   13,146.56 : 18,142.16 = 7,178.22 : x
2. Step 2: Convert to fraction form
   13,146.56/18,142.16 = 7,178.22/x
3. Step 3: Cross multiply
   13,146.56x = 18,142.16 × 7,178.22
4. Step 4: Simplify right side
   13,146.56x = 130,228,379.86
5. Step 5: Solve for x
   x = 130,228,379.86/13,146.56
6. Step 6: Final answer
   x = 9,905.89