Finding the Fourth Proportional to 13,109.72, 18,090.90 and 7,141.44

Step by Step Solution

1. Step 1: Write the proportion equation
   13,109.72 : 18,090.90 = 7,141.44 : x
2. Step 2: Convert to fraction form
   13,109.72/18,090.90 = 7,141.44/x
3. Step 3: Cross multiply
   13,109.72x = 18,090.90 × 7,141.44
4. Step 4: Simplify right side
   13,109.72x = 129,195,076.90
5. Step 5: Solve for x
   x = 129,195,076.90/13,109.72
6. Step 6: Final answer
   x = 9,854.91