Finding the Fourth Proportional to 11,112.39, 16,668.18 and 3,321

Step by Step Solution

1. Step 1: Write the proportion equation
   11,112.39 : 16,668.18 = 3,321 : x
2. Step 2: Convert to fraction form
   11,112.39/16,668.18 = 3,321/x
3. Step 3: Cross multiply
   11,112.39x = 16,668.18 × 3,321
4. Step 4: Simplify right side
   11,112.39x = 55,355,025.78
5. Step 5: Solve for x
   x = 55,355,025.78/11,112.39
6. Step 6: Final answer
   x = 4,981.38