Finding the Fourth Proportional to 13,911.28, 19,196.43 and 7,861.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,911.28 : 19,196.43 = 7,861.20 : x
2. Step 2: Convert to fraction form
   13,911.28/19,196.43 = 7,861.20/x
3. Step 3: Cross multiply
   13,911.28x = 19,196.43 × 7,861.20
4. Step 4: Simplify right side
   13,911.28x = 150,907,015.19
5. Step 5: Solve for x
   x = 150,907,015.19/13,911.28
6. Step 6: Final answer
   x = 10,847.82