Finding the Fourth Proportional to 11,212.84, 16,819.72 and 3,315.36

Step by Step Solution

1. Step 1: Write the proportion equation
   11,212.84 : 16,819.72 = 3,315.36 : x
2. Step 2: Convert to fraction form
   11,212.84/16,819.72 = 3,315.36/x
3. Step 3: Cross multiply
   11,212.84x = 16,819.72 × 3,315.36
4. Step 4: Simplify right side
   11,212.84x = 55,763,426.90
5. Step 5: Solve for x
   x = 55,763,426.90/11,212.84
6. Step 6: Final answer
   x = 4,973.18