Finding the Fourth Proportional to 9,972.21, 13,761.72 and 5,722.14

Step by Step Solution

1. Step 1: Write the proportion equation
   9,972.21 : 13,761.72 = 5,722.14 : x
2. Step 2: Convert to fraction form
   9,972.21/13,761.72 = 5,722.14/x
3. Step 3: Cross multiply
   9,972.21x = 13,761.72 × 5,722.14
4. Step 4: Simplify right side
   9,972.21x = 78,746,488.48
5. Step 5: Solve for x
   x = 78,746,488.48/9,972.21
6. Step 6: Final answer
   x = 7,896.59