Finding the Fourth Proportional to 1,555.20, 2,147.61 and 965.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,555.20 : 2,147.61 = 965.88 : x
2. Step 2: Convert to fraction form
   1,555.20/2,147.61 = 965.88/x
3. Step 3: Cross multiply
   1,555.20x = 2,147.61 × 965.88
4. Step 4: Simplify right side
   1,555.20x = 2,074,333.55
5. Step 5: Solve for x
   x = 2,074,333.55/1,555.20
6. Step 6: Final answer
   x = 1,333.81