Finding the Fourth Proportional to 13,862.80, 19,131.12 and 10,499.68

Step by Step Solution

1. Step 1: Write the proportion equation
   13,862.80 : 19,131.12 = 10,499.68 : x
2. Step 2: Convert to fraction form
   13,862.80/19,131.12 = 10,499.68/x
3. Step 3: Cross multiply
   13,862.80x = 19,131.12 × 10,499.68
4. Step 4: Simplify right side
   13,862.80x = 200,870,638.04
5. Step 5: Solve for x
   x = 200,870,638.04/13,862.80
6. Step 6: Final answer
   x = 14,489.90