Finding the Fourth Proportional to 1,338.96, 1,998.50 and 1,123.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,338.96 : 1,998.50 = 1,123.28 : x
2. Step 2: Convert to fraction form
   1,338.96/1,998.50 = 1,123.28/x
3. Step 3: Cross multiply
   1,338.96x = 1,998.50 × 1,123.28
4. Step 4: Simplify right side
   1,338.96x = 2,244,875.08
5. Step 5: Solve for x
   x = 2,244,875.08/1,338.96
6. Step 6: Final answer
   x = 1,676.58