Finding the Fourth Proportional to 9,971.60, 13,760.24 and 5,721.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,971.60 : 13,760.24 = 5,721.76 : x
2. Step 2: Convert to fraction form
   9,971.60/13,760.24 = 5,721.76/x
3. Step 3: Cross multiply
   9,971.60x = 13,760.24 × 5,721.76
4. Step 4: Simplify right side
   9,971.60x = 78,732,790.82
5. Step 5: Solve for x
   x = 78,732,790.82/9,971.60
6. Step 6: Final answer
   x = 7,895.70