Finding the Fourth Proportional to 1,421.10, 1,961.73 and 955.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.10 : 1,961.73 = 955.62 : x
2. Step 2: Convert to fraction form
   1,421.10/1,961.73 = 955.62/x
3. Step 3: Cross multiply
   1,421.10x = 1,961.73 × 955.62
4. Step 4: Simplify right side
   1,421.10x = 1,874,668.42
5. Step 5: Solve for x
   x = 1,874,668.42/1,421.10
6. Step 6: Final answer
   x = 1,319.17