Finding the Fourth Proportional to 1,439.33, 2,158.56 and 945.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.33 : 2,158.56 = 945.71 : x
2. Step 2: Convert to fraction form
   1,439.33/2,158.56 = 945.71/x
3. Step 3: Cross multiply
   1,439.33x = 2,158.56 × 945.71
4. Step 4: Simplify right side
   1,439.33x = 2,041,381.22
5. Step 5: Solve for x
   x = 2,041,381.22/1,439.33
6. Step 6: Final answer
   x = 1,418.29