Finding the Fourth Proportional to 1,441.20, 1,988.69 and 851.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,441.20 : 1,988.69 = 851.63 : x
2. Step 2: Convert to fraction form
   1,441.20/1,988.69 = 851.63/x
3. Step 3: Cross multiply
   1,441.20x = 1,988.69 × 851.63
4. Step 4: Simplify right side
   1,441.20x = 1,693,613.86
5. Step 5: Solve for x
   x = 1,693,613.86/1,441.20
6. Step 6: Final answer
   x = 1,175.14