Finding the Fourth Proportional to 1,436.40, 2,149.16 and 851.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.40 : 2,149.16 = 851.72 : x
2. Step 2: Convert to fraction form
   1,436.40/2,149.16 = 851.72/x
3. Step 3: Cross multiply
   1,436.40x = 2,149.16 × 851.72
4. Step 4: Simplify right side
   1,436.40x = 1,830,467.55
5. Step 5: Solve for x
   x = 1,830,467.55/1,436.40
6. Step 6: Final answer
   x = 1,274.34