Finding the Fourth Proportional to 13,856.89, 19,121.79 and 7,888.54

Step by Step Solution

1. Step 1: Write the proportion equation
   13,856.89 : 19,121.79 = 7,888.54 : x
2. Step 2: Convert to fraction form
   13,856.89/19,121.79 = 7,888.54/x
3. Step 3: Cross multiply
   13,856.89x = 19,121.79 × 7,888.54
4. Step 4: Simplify right side
   13,856.89x = 150,843,005.29
5. Step 5: Solve for x
   x = 150,843,005.29/13,856.89
6. Step 6: Final answer
   x = 10,885.78