Finding the Fourth Proportional to 9,615.78, 13,258.86 and 7,841.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,615.78 : 13,258.86 = 7,841.88 : x
2. Step 2: Convert to fraction form
   9,615.78/13,258.86 = 7,841.88/x
3. Step 3: Cross multiply
   9,615.78x = 13,258.86 × 7,841.88
4. Step 4: Simplify right side
   9,615.78x = 103,974,389.06
5. Step 5: Solve for x
   x = 103,974,389.06/9,615.78
6. Step 6: Final answer
   x = 10,812.89