Finding the Fourth Proportional to 1,440.74, 1,988.17 and 851.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.74 : 1,988.17 = 851.47 : x
2. Step 2: Convert to fraction form
   1,440.74/1,988.17 = 851.47/x
3. Step 3: Cross multiply
   1,440.74x = 1,988.17 × 851.47
4. Step 4: Simplify right side
   1,440.74x = 1,692,860.01
5. Step 5: Solve for x
   x = 1,692,860.01/1,440.74
6. Step 6: Final answer
   x = 1,174.99