Finding the Fourth Proportional to 2,251.89, 3,372.96 and 1,428.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,251.89 : 3,372.96 = 1,428.12 : x
2. Step 2: Convert to fraction form
   2,251.89/3,372.96 = 1,428.12/x
3. Step 3: Cross multiply
   2,251.89x = 3,372.96 × 1,428.12
4. Step 4: Simplify right side
   2,251.89x = 4,816,991.64
5. Step 5: Solve for x
   x = 4,816,991.64/2,251.89
6. Step 6: Final answer
   x = 2,139.09