Finding the Fourth Proportional to 5,617.88, 8,420.89 and 2,105.59

Step by Step Solution

1. Step 1: Write the proportion equation
   5,617.88 : 8,420.89 = 2,105.59 : x
2. Step 2: Convert to fraction form
   5,617.88/8,420.89 = 2,105.59/x
3. Step 3: Cross multiply
   5,617.88x = 8,420.89 × 2,105.59
4. Step 4: Simplify right side
   5,617.88x = 17,730,941.78
5. Step 5: Solve for x
   x = 17,730,941.78/5,617.88
6. Step 6: Final answer
   x = 3,156.16