Finding the Fourth Proportional to 13,886.89, 19,163.43 and 7,920.48

Step by Step Solution

1. Step 1: Write the proportion equation
   13,886.89 : 19,163.43 = 7,920.48 : x
2. Step 2: Convert to fraction form
   13,886.89/19,163.43 = 7,920.48/x
3. Step 3: Cross multiply
   13,886.89x = 19,163.43 × 7,920.48
4. Step 4: Simplify right side
   13,886.89x = 151,783,583.85
5. Step 5: Solve for x
   x = 151,783,583.85/13,886.89
6. Step 6: Final answer
   x = 10,929.99