Finding the Fourth Proportional to 1,420.88, 1,961.28 and 949.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.88 : 1,961.28 = 949.59 : x
2. Step 2: Convert to fraction form
   1,420.88/1,961.28 = 949.59/x
3. Step 3: Cross multiply
   1,420.88x = 1,961.28 × 949.59
4. Step 4: Simplify right side
   1,420.88x = 1,862,411.88
5. Step 5: Solve for x
   x = 1,862,411.88/1,420.88
6. Step 6: Final answer
   x = 1,310.75