Finding the Fourth Proportional to 9,961.72, 13,749.32 and 5,713.47

Step by Step Solution

1. Step 1: Write the proportion equation
   9,961.72 : 13,749.32 = 5,713.47 : x
2. Step 2: Convert to fraction form
   9,961.72/13,749.32 = 5,713.47/x
3. Step 3: Cross multiply
   9,961.72x = 13,749.32 × 5,713.47
4. Step 4: Simplify right side
   9,961.72x = 78,556,341.62
5. Step 5: Solve for x
   x = 78,556,341.62/9,961.72
6. Step 6: Final answer
   x = 7,885.82