Finding the Fourth Proportional to 9,442.16, 13,022.43 and 8,380.70

Step by Step Solution

1. Step 1: Write the proportion equation
   9,442.16 : 13,022.43 = 8,380.70 : x
2. Step 2: Convert to fraction form
   9,442.16/13,022.43 = 8,380.70/x
3. Step 3: Cross multiply
   9,442.16x = 13,022.43 × 8,380.70
4. Step 4: Simplify right side
   9,442.16x = 109,137,079.10
5. Step 5: Solve for x
   x = 109,137,079.10/9,442.16
6. Step 6: Final answer
   x = 11,558.49