Finding the Fourth Proportional to 1,428.63, 2,145.27 and 884.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.63 : 2,145.27 = 884.28 : x
2. Step 2: Convert to fraction form
   1,428.63/2,145.27 = 884.28/x
3. Step 3: Cross multiply
   1,428.63x = 2,145.27 × 884.28
4. Step 4: Simplify right side
   1,428.63x = 1,897,019.36
5. Step 5: Solve for x
   x = 1,897,019.36/1,428.63
6. Step 6: Final answer
   x = 1,327.86