Finding the Fourth Proportional to 9,959.89, 13,735.78 and 7,860.37

Step by Step Solution

1. Step 1: Write the proportion equation
   9,959.89 : 13,735.78 = 7,860.37 : x
2. Step 2: Convert to fraction form
   9,959.89/13,735.78 = 7,860.37/x
3. Step 3: Cross multiply
   9,959.89x = 13,735.78 × 7,860.37
4. Step 4: Simplify right side
   9,959.89x = 107,968,313.04
5. Step 5: Solve for x
   x = 107,968,313.04/9,959.89
6. Step 6: Final answer
   x = 10,840.31