Finding the Fourth Proportional to 10,145.39, 13,974.59 and 7,155.97

Step by Step Solution

1. Step 1: Write the proportion equation
   10,145.39 : 13,974.59 = 7,155.97 : x
2. Step 2: Convert to fraction form
   10,145.39/13,974.59 = 7,155.97/x
3. Step 3: Cross multiply
   10,145.39x = 13,974.59 × 7,155.97
4. Step 4: Simplify right side
   10,145.39x = 100,001,729.76
5. Step 5: Solve for x
   x = 100,001,729.76/10,145.39
6. Step 6: Final answer
   x = 9,856.87