Finding the Fourth Proportional to 9,420.36, 12,997.88 and 5,440.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,420.36 : 12,997.88 = 5,440.72 : x
2. Step 2: Convert to fraction form
   9,420.36/12,997.88 = 5,440.72/x
3. Step 3: Cross multiply
   9,420.36x = 12,997.88 × 5,440.72
4. Step 4: Simplify right side
   9,420.36x = 70,717,825.67
5. Step 5: Solve for x
   x = 70,717,825.67/9,420.36
6. Step 6: Final answer
   x = 7,506.91