Finding the Fourth Proportional to 9,864.78, 13,603.30 and 7,736.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,864.78 : 13,603.30 = 7,736.50 : x
2. Step 2: Convert to fraction form
   9,864.78/13,603.30 = 7,736.50/x
3. Step 3: Cross multiply
   9,864.78x = 13,603.30 × 7,736.50
4. Step 4: Simplify right side
   9,864.78x = 105,241,930.45
5. Step 5: Solve for x
   x = 105,241,930.45/9,864.78
6. Step 6: Final answer
   x = 10,668.45