Finding the Fourth Proportional to 13,826.45, 19,080.50 and 7,857.96

Step by Step Solution

1. Step 1: Write the proportion equation
   13,826.45 : 19,080.50 = 7,857.96 : x
2. Step 2: Convert to fraction form
   13,826.45/19,080.50 = 7,857.96/x
3. Step 3: Cross multiply
   13,826.45x = 19,080.50 × 7,857.96
4. Step 4: Simplify right side
   13,826.45x = 149,933,896.98
5. Step 5: Solve for x
   x = 149,933,896.98/13,826.45
6. Step 6: Final answer
   x = 10,843.99