Finding the Fourth Proportional to 9,420.39, 12,999.56 and 5,440.86

Step by Step Solution

1. Step 1: Write the proportion equation
   9,420.39 : 12,999.56 = 5,440.86 : x
2. Step 2: Convert to fraction form
   9,420.39/12,999.56 = 5,440.86/x
3. Step 3: Cross multiply
   9,420.39x = 12,999.56 × 5,440.86
4. Step 4: Simplify right side
   9,420.39x = 70,728,758.82
5. Step 5: Solve for x
   x = 70,728,758.82/9,420.39
6. Step 6: Final answer
   x = 7,508.05