Finding the Fourth Proportional to 5,390.89, 8,090.89 and 2,106.34

Step by Step Solution

1. Step 1: Write the proportion equation
   5,390.89 : 8,090.89 = 2,106.34 : x
2. Step 2: Convert to fraction form
   5,390.89/8,090.89 = 2,106.34/x
3. Step 3: Cross multiply
   5,390.89x = 8,090.89 × 2,106.34
4. Step 4: Simplify right side
   5,390.89x = 17,042,139.75
5. Step 5: Solve for x
   x = 17,042,139.75/5,390.89
6. Step 6: Final answer
   x = 3,161.29