Finding the Fourth Proportional to 10,087.31, 13,920.56 and 5,611.11

Step by Step Solution

1. Step 1: Write the proportion equation
   10,087.31 : 13,920.56 = 5,611.11 : x
2. Step 2: Convert to fraction form
   10,087.31/13,920.56 = 5,611.11/x
3. Step 3: Cross multiply
   10,087.31x = 13,920.56 × 5,611.11
4. Step 4: Simplify right side
   10,087.31x = 78,109,765.37
5. Step 5: Solve for x
   x = 78,109,765.37/10,087.31
6. Step 6: Final answer
   x = 7,743.37