Finding the Fourth Proportional to 10,087.61, 13,921.47 and 5,611.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,087.61 : 13,921.47 = 5,611.28 : x
2. Step 2: Convert to fraction form
   10,087.61/13,921.47 = 5,611.28/x
3. Step 3: Cross multiply
   10,087.61x = 13,921.47 × 5,611.28
4. Step 4: Simplify right side
   10,087.61x = 78,117,196.57
5. Step 5: Solve for x
   x = 78,117,196.57/10,087.61
6. Step 6: Final answer
   x = 7,743.88