Finding the Fourth Proportional to 1,420.89, 1,961.43 and 955.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.89 : 1,961.43 = 955.41 : x
2. Step 2: Convert to fraction form
   1,420.89/1,961.43 = 955.41/x
3. Step 3: Cross multiply
   1,420.89x = 1,961.43 × 955.41
4. Step 4: Simplify right side
   1,420.89x = 1,873,955.25
5. Step 5: Solve for x
   x = 1,873,955.25/1,420.89
6. Step 6: Final answer
   x = 1,318.86