Finding the Fourth Proportional to 5,642.36, 8,476.51 and 3,980.31

Step by Step Solution

1. Step 1: Write the proportion equation
   5,642.36 : 8,476.51 = 3,980.31 : x
2. Step 2: Convert to fraction form
   5,642.36/8,476.51 = 3,980.31/x
3. Step 3: Cross multiply
   5,642.36x = 8,476.51 × 3,980.31
4. Step 4: Simplify right side
   5,642.36x = 33,739,139.31
5. Step 5: Solve for x
   x = 33,739,139.31/5,642.36
6. Step 6: Final answer
   x = 5,979.62