Finding the Fourth Proportional to 13,145.72, 18,141.52 and 7,177.85

Step by Step Solution

1. Step 1: Write the proportion equation
   13,145.72 : 18,141.52 = 7,177.85 : x
2. Step 2: Convert to fraction form
   13,145.72/18,141.52 = 7,177.85/x
3. Step 3: Cross multiply
   13,145.72x = 18,141.52 × 7,177.85
4. Step 4: Simplify right side
   13,145.72x = 130,217,018.62
5. Step 5: Solve for x
   x = 130,217,018.62/13,145.72
6. Step 6: Final answer
   x = 9,905.66