Finding the Fourth Proportional to 13,879.56, 19,153.31 and 7,913.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,879.56 : 19,153.31 = 7,913.15 : x
2. Step 2: Convert to fraction form
   13,879.56/19,153.31 = 7,913.15/x
3. Step 3: Cross multiply
   13,879.56x = 19,153.31 × 7,913.15
4. Step 4: Simplify right side
   13,879.56x = 151,562,879.69
5. Step 5: Solve for x
   x = 151,562,879.69/13,879.56
6. Step 6: Final answer
   x = 10,919.87