Finding the Fourth Proportional to 1,434.28, 2,151.88 and 885.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.28 : 2,151.88 = 885.72 : x
2. Step 2: Convert to fraction form
   1,434.28/2,151.88 = 885.72/x
3. Step 3: Cross multiply
   1,434.28x = 2,151.88 × 885.72
4. Step 4: Simplify right side
   1,434.28x = 1,905,963.15
5. Step 5: Solve for x
   x = 1,905,963.15/1,434.28
6. Step 6: Final answer
   x = 1,328.86