Finding the Fourth Proportional to 2,191.29, 3,023.94 and 1,221.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,191.29 : 3,023.94 = 1,221.09 : x
2. Step 2: Convert to fraction form
   2,191.29/3,023.94 = 1,221.09/x
3. Step 3: Cross multiply
   2,191.29x = 3,023.94 × 1,221.09
4. Step 4: Simplify right side
   2,191.29x = 3,692,502.89
5. Step 5: Solve for x
   x = 3,692,502.89/2,191.29
6. Step 6: Final answer
   x = 1,685.08