Finding the Fourth Proportional to 12,215.67, 18,291.78 and 10,471.83

Step by Step Solution

1. Step 1: Write the proportion equation
   12,215.67 : 18,291.78 = 10,471.83 : x
2. Step 2: Convert to fraction form
   12,215.67/18,291.78 = 10,471.83/x
3. Step 3: Cross multiply
   12,215.67x = 18,291.78 × 10,471.83
4. Step 4: Simplify right side
   12,215.67x = 191,548,410.56
5. Step 5: Solve for x
   x = 191,548,410.56/12,215.67
6. Step 6: Final answer
   x = 15,680.55