Finding the Fourth Proportional to 2,111.11, 3,166.64 and 551.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.11 : 3,166.64 = 551.09 : x
2. Step 2: Convert to fraction form
   2,111.11/3,166.64 = 551.09/x
3. Step 3: Cross multiply
   2,111.11x = 3,166.64 × 551.09
4. Step 4: Simplify right side
   2,111.11x = 1,745,100.88
5. Step 5: Solve for x
   x = 1,745,100.88/2,111.11
6. Step 6: Final answer
   x = 826.63