Finding the Fourth Proportional to 10,087.71, 13,921.00 and 5,611.21

Step by Step Solution

1. Step 1: Write the proportion equation
   10,087.71 : 13,921.00 = 5,611.21 : x
2. Step 2: Convert to fraction form
   10,087.71/13,921.00 = 5,611.21/x
3. Step 3: Cross multiply
   10,087.71x = 13,921.00 × 5,611.21
4. Step 4: Simplify right side
   10,087.71x = 78,113,605.58
5. Step 5: Solve for x
   x = 78,113,605.58/10,087.71
6. Step 6: Final answer
   x = 7,743.45