Finding the Fourth Proportional to 9,912.57, 13,679.37 and 5,720.82

Step by Step Solution

1. Step 1: Write the proportion equation
   9,912.57 : 13,679.37 = 5,720.82 : x
2. Step 2: Convert to fraction form
   9,912.57/13,679.37 = 5,720.82/x
3. Step 3: Cross multiply
   9,912.57x = 13,679.37 × 5,720.82
4. Step 4: Simplify right side
   9,912.57x = 78,257,213.48
5. Step 5: Solve for x
   x = 78,257,213.48/9,912.57
6. Step 6: Final answer
   x = 7,894.75