Finding the Fourth Proportional to 12,291.41, 18,404.31 and 10,815.19

Step by Step Solution

1. Step 1: Write the proportion equation
   12,291.41 : 18,404.31 = 10,815.19 : x
2. Step 2: Convert to fraction form
   12,291.41/18,404.31 = 10,815.19/x
3. Step 3: Cross multiply
   12,291.41x = 18,404.31 × 10,815.19
4. Step 4: Simplify right side
   12,291.41x = 199,046,104.02
5. Step 5: Solve for x
   x = 199,046,104.02/12,291.41
6. Step 6: Final answer
   x = 16,193.92