Finding the Fourth Proportional to 9,912.12, 13,677.74 and 5,721.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,912.12 : 13,677.74 = 5,721.72 : x
2. Step 2: Convert to fraction form
   9,912.12/13,677.74 = 5,721.72/x
3. Step 3: Cross multiply
   9,912.12x = 13,677.74 × 5,721.72
4. Step 4: Simplify right side
   9,912.12x = 78,260,198.51
5. Step 5: Solve for x
   x = 78,260,198.51/9,912.12
6. Step 6: Final answer
   x = 7,895.40