Finding the Fourth Proportional to 9,631.89, 13,250.39 and 7,859.61

Step by Step Solution

1. Step 1: Write the proportion equation
   9,631.89 : 13,250.39 = 7,859.61 : x
2. Step 2: Convert to fraction form
   9,631.89/13,250.39 = 7,859.61/x
3. Step 3: Cross multiply
   9,631.89x = 13,250.39 × 7,859.61
4. Step 4: Simplify right side
   9,631.89x = 104,142,858.45
5. Step 5: Solve for x
   x = 104,142,858.45/9,631.89
6. Step 6: Final answer
   x = 10,812.30