Finding the Fourth Proportional to 11,215.98, 16,808.82 and 4,286.70

Step by Step Solution

1. Step 1: Write the proportion equation
   11,215.98 : 16,808.82 = 4,286.70 : x
2. Step 2: Convert to fraction form
   11,215.98/16,808.82 = 4,286.70/x
3. Step 3: Cross multiply
   11,215.98x = 16,808.82 × 4,286.70
4. Step 4: Simplify right side
   11,215.98x = 72,054,368.69
5. Step 5: Solve for x
   x = 72,054,368.69/11,215.98
6. Step 6: Final answer
   x = 6,424.26