Finding the Fourth Proportional to 9,961.82, 13,747.28 and 5,485.57

Step by Step Solution

1. Step 1: Write the proportion equation
   9,961.82 : 13,747.28 = 5,485.57 : x
2. Step 2: Convert to fraction form
   9,961.82/13,747.28 = 5,485.57/x
3. Step 3: Cross multiply
   9,961.82x = 13,747.28 × 5,485.57
4. Step 4: Simplify right side
   9,961.82x = 75,411,720.85
5. Step 5: Solve for x
   x = 75,411,720.85/9,961.82
6. Step 6: Final answer
   x = 7,570.07