Finding the Fourth Proportional to 1,077.89, 1,608.50 and 961.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.89 : 1,608.50 = 961.40 : x
2. Step 2: Convert to fraction form
   1,077.89/1,608.50 = 961.40/x
3. Step 3: Cross multiply
   1,077.89x = 1,608.50 × 961.40
4. Step 4: Simplify right side
   1,077.89x = 1,546,411.90
5. Step 5: Solve for x
   x = 1,546,411.90/1,077.89
6. Step 6: Final answer
   x = 1,434.67