Finding the Fourth Proportional to 2,221.72, 3,326.43 and 1,123.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,221.72 : 3,326.43 = 1,123.79 : x
2. Step 2: Convert to fraction form
   2,221.72/3,326.43 = 1,123.79/x
3. Step 3: Cross multiply
   2,221.72x = 3,326.43 × 1,123.79
4. Step 4: Simplify right side
   2,221.72x = 3,738,208.74
5. Step 5: Solve for x
   x = 3,738,208.74/2,221.72
6. Step 6: Final answer
   x = 1,682.57