Finding the Fourth Proportional to 5,561.97, 7,664.89 and 3,987.33

Step by Step Solution

1. Step 1: Write the proportion equation
   5,561.97 : 7,664.89 = 3,987.33 : x
2. Step 2: Convert to fraction form
   5,561.97/7,664.89 = 3,987.33/x
3. Step 3: Cross multiply
   5,561.97x = 7,664.89 × 3,987.33
4. Step 4: Simplify right side
   5,561.97x = 30,562,445.84
5. Step 5: Solve for x
   x = 30,562,445.84/5,561.97
6. Step 6: Final answer
   x = 5,494.90