Finding the Fourth Proportional to 13,811, 19,059.50 and 7,841.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,811 : 19,059.50 = 7,841.72 : x
2. Step 2: Convert to fraction form
   13,811/19,059.50 = 7,841.72/x
3. Step 3: Cross multiply
   13,811x = 19,059.50 × 7,841.72
4. Step 4: Simplify right side
   13,811x = 149,459,262.34
5. Step 5: Solve for x
   x = 149,459,262.34/13,811
6. Step 6: Final answer
   x = 10,821.76