Finding the Fourth Proportional to 1,428.47, 2,141.67 and 965.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.47 : 2,141.67 = 965.09 : x
2. Step 2: Convert to fraction form
   1,428.47/2,141.67 = 965.09/x
3. Step 3: Cross multiply
   1,428.47x = 2,141.67 × 965.09
4. Step 4: Simplify right side
   1,428.47x = 2,066,904.30
5. Step 5: Solve for x
   x = 2,066,904.30/1,428.47
6. Step 6: Final answer
   x = 1,446.94