Finding the Fourth Proportional to 10,087.98, 13,921.21 and 5,611.64

Step by Step Solution

1. Step 1: Write the proportion equation
   10,087.98 : 13,921.21 = 5,611.64 : x
2. Step 2: Convert to fraction form
   10,087.98/13,921.21 = 5,611.64/x
3. Step 3: Cross multiply
   10,087.98x = 13,921.21 × 5,611.64
4. Step 4: Simplify right side
   10,087.98x = 78,120,735.25
5. Step 5: Solve for x
   x = 78,120,735.25/10,087.98
6. Step 6: Final answer
   x = 7,743.94