Finding the Fourth Proportional to 3,558.89, 5,335.56 and 2,171.98

Step by Step Solution

1. Step 1: Write the proportion equation
   3,558.89 : 5,335.56 = 2,171.98 : x
2. Step 2: Convert to fraction form
   3,558.89/5,335.56 = 2,171.98/x
3. Step 3: Cross multiply
   3,558.89x = 5,335.56 × 2,171.98
4. Step 4: Simplify right side
   3,558.89x = 11,588,729.61
5. Step 5: Solve for x
   x = 11,588,729.61/3,558.89
6. Step 6: Final answer
   x = 3,256.28