Finding the Fourth Proportional to 13,141.82, 18,135.78 and 7,173.63

Step by Step Solution

1. Step 1: Write the proportion equation
   13,141.82 : 18,135.78 = 7,173.63 : x
2. Step 2: Convert to fraction form
   13,141.82/18,135.78 = 7,173.63/x
3. Step 3: Cross multiply
   13,141.82x = 18,135.78 × 7,173.63
4. Step 4: Simplify right side
   13,141.82x = 130,099,248.93
5. Step 5: Solve for x
   x = 130,099,248.93/13,141.82
6. Step 6: Final answer
   x = 9,899.64