Finding the Fourth Proportional to 9,180.81, 12,667.32 and 5,403.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,180.81 : 12,667.32 = 5,403.78 : x
2. Step 2: Convert to fraction form
   9,180.81/12,667.32 = 5,403.78/x
3. Step 3: Cross multiply
   9,180.81x = 12,667.32 × 5,403.78
4. Step 4: Simplify right side
   9,180.81x = 68,451,410.47
5. Step 5: Solve for x
   x = 68,451,410.47/9,180.81
6. Step 6: Final answer
   x = 7,455.92