Finding the Fourth Proportional to 1,550.42, 2,139.58 and 851.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.42 : 2,139.58 = 851.80 : x
2. Step 2: Convert to fraction form
   1,550.42/2,139.58 = 851.80/x
3. Step 3: Cross multiply
   1,550.42x = 2,139.58 × 851.80
4. Step 4: Simplify right side
   1,550.42x = 1,822,483.55
5. Step 5: Solve for x
   x = 1,822,483.55/1,550.42
6. Step 6: Final answer
   x = 1,175.48