Finding the Fourth Proportional to 1,440.68, 1,988.18 and 851.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.68 : 1,988.18 = 851.24 : x
2. Step 2: Convert to fraction form
   1,440.68/1,988.18 = 851.24/x
3. Step 3: Cross multiply
   1,440.68x = 1,988.18 × 851.24
4. Step 4: Simplify right side
   1,440.68x = 1,692,418.34
5. Step 5: Solve for x
   x = 1,692,418.34/1,440.68
6. Step 6: Final answer
   x = 1,174.74