Finding the Fourth Proportional to 5,406.31, 8,109.42 and 2,117.08

Step by Step Solution

1. Step 1: Write the proportion equation
   5,406.31 : 8,109.42 = 2,117.08 : x
2. Step 2: Convert to fraction form
   5,406.31/8,109.42 = 2,117.08/x
3. Step 3: Cross multiply
   5,406.31x = 8,109.42 × 2,117.08
4. Step 4: Simplify right side
   5,406.31x = 17,168,290.89
5. Step 5: Solve for x
   x = 17,168,290.89/5,406.31
6. Step 6: Final answer
   x = 3,175.60