Finding the Fourth Proportional to 3,699.31, 5,540.73 and 3,411.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,699.31 : 5,540.73 = 3,411.20 : x
2. Step 2: Convert to fraction form
   3,699.31/5,540.73 = 3,411.20/x
3. Step 3: Cross multiply
   3,699.31x = 5,540.73 × 3,411.20
4. Step 4: Simplify right side
   3,699.31x = 18,900,538.18
5. Step 5: Solve for x
   x = 18,900,538.18/3,699.31
6. Step 6: Final answer
   x = 5,109.21