Finding the Fourth Proportional to 9,961.78, 13,747.31 and 5,713

Step by Step Solution

1. Step 1: Write the proportion equation
   9,961.78 : 13,747.31 = 5,713 : x
2. Step 2: Convert to fraction form
   9,961.78/13,747.31 = 5,713/x
3. Step 3: Cross multiply
   9,961.78x = 13,747.31 × 5,713
4. Step 4: Simplify right side
   9,961.78x = 78,538,382.03
5. Step 5: Solve for x
   x = 78,538,382.03/9,961.78
6. Step 6: Final answer
   x = 7,883.97