Finding the Fourth Proportional to 5,402.80, 8,100.96 and 2,111.97

Step by Step Solution

1. Step 1: Write the proportion equation
   5,402.80 : 8,100.96 = 2,111.97 : x
2. Step 2: Convert to fraction form
   5,402.80/8,100.96 = 2,111.97/x
3. Step 3: Cross multiply
   5,402.80x = 8,100.96 × 2,111.97
4. Step 4: Simplify right side
   5,402.80x = 17,108,984.49
5. Step 5: Solve for x
   x = 17,108,984.49/5,402.80
6. Step 6: Final answer
   x = 3,166.69