Finding the Fourth Proportional to 2,147.58, 3,221.31 and 587.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.58 : 3,221.31 = 587.55 : x
2. Step 2: Convert to fraction form
   2,147.58/3,221.31 = 587.55/x
3. Step 3: Cross multiply
   2,147.58x = 3,221.31 × 587.55
4. Step 4: Simplify right side
   2,147.58x = 1,892,680.69
5. Step 5: Solve for x
   x = 1,892,680.69/2,147.58
6. Step 6: Final answer
   x = 881.31