Finding the Fourth Proportional to 13,880.72, 19,155.88 and 7,911.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,880.72 : 19,155.88 = 7,911.42 : x
2. Step 2: Convert to fraction form
   13,880.72/19,155.88 = 7,911.42/x
3. Step 3: Cross multiply
   13,880.72x = 19,155.88 × 7,911.42
4. Step 4: Simplify right side
   13,880.72x = 151,550,231.93
5. Step 5: Solve for x
   x = 151,550,231.93/13,880.72
6. Step 6: Final answer
   x = 10,918.04