Finding the Fourth Proportional to 13,109.81, 18,090.98 and 7,141.52

Step by Step Solution

1. Step 1: Write the proportion equation
   13,109.81 : 18,090.98 = 7,141.52 : x
2. Step 2: Convert to fraction form
   13,109.81/18,090.98 = 7,141.52/x
3. Step 3: Cross multiply
   13,109.81x = 18,090.98 × 7,141.52
4. Step 4: Simplify right side
   13,109.81x = 129,197,059.78
5. Step 5: Solve for x
   x = 129,197,059.78/13,109.81
6. Step 6: Final answer
   x = 9,854.99