Finding the Fourth Proportional to 1,428.16, 2,141.21 and 964.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.16 : 2,141.21 = 964.79 : x
2. Step 2: Convert to fraction form
   1,428.16/2,141.21 = 964.79/x
3. Step 3: Cross multiply
   1,428.16x = 2,141.21 × 964.79
4. Step 4: Simplify right side
   1,428.16x = 2,065,820.94
5. Step 5: Solve for x
   x = 2,065,820.94/1,428.16
6. Step 6: Final answer
   x = 1,446.49