Finding the Fourth Proportional to 12,103.80, 18,139.59 and 10,619.07

Step by Step Solution

1. Step 1: Write the proportion equation
   12,103.80 : 18,139.59 = 10,619.07 : x
2. Step 2: Convert to fraction form
   12,103.80/18,139.59 = 10,619.07/x
3. Step 3: Cross multiply
   12,103.80x = 18,139.59 × 10,619.07
4. Step 4: Simplify right side
   12,103.80x = 192,625,575.98
5. Step 5: Solve for x
   x = 192,625,575.98/12,103.80
6. Step 6: Final answer
   x = 15,914.47