Finding the Fourth Proportional to 8,905.78, 12,290.16 and 5,368.24

Step by Step Solution

1. Step 1: Write the proportion equation
   8,905.78 : 12,290.16 = 5,368.24 : x
2. Step 2: Convert to fraction form
   8,905.78/12,290.16 = 5,368.24/x
3. Step 3: Cross multiply
   8,905.78x = 12,290.16 × 5,368.24
4. Step 4: Simplify right side
   8,905.78x = 65,976,528.52
5. Step 5: Solve for x
   x = 65,976,528.52/8,905.78
6. Step 6: Final answer
   x = 7,408.28