Finding the Fourth Proportional to 2,120.42, 3,176.31 and 887.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,120.42 : 3,176.31 = 887.33 : x
2. Step 2: Convert to fraction form
   2,120.42/3,176.31 = 887.33/x
3. Step 3: Cross multiply
   2,120.42x = 3,176.31 × 887.33
4. Step 4: Simplify right side
   2,120.42x = 2,818,435.15
5. Step 5: Solve for x
   x = 2,818,435.15/2,120.42
6. Step 6: Final answer
   x = 1,329.19