Finding the Fourth Proportional to 13,091.56, 18,065.81 and 7,123.25

Step by Step Solution

1. Step 1: Write the proportion equation
   13,091.56 : 18,065.81 = 7,123.25 : x
2. Step 2: Convert to fraction form
   13,091.56/18,065.81 = 7,123.25/x
3. Step 3: Cross multiply
   13,091.56x = 18,065.81 × 7,123.25
4. Step 4: Simplify right side
   13,091.56x = 128,687,273.21
5. Step 5: Solve for x
   x = 128,687,273.21/13,091.56
6. Step 6: Final answer
   x = 9,829.79