Finding the Fourth Proportional to 9,155.28, 12,634.20 and 5,378.52

Step by Step Solution

1. Step 1: Write the proportion equation
   9,155.28 : 12,634.20 = 5,378.52 : x
2. Step 2: Convert to fraction form
   9,155.28/12,634.20 = 5,378.52/x
3. Step 3: Cross multiply
   9,155.28x = 12,634.20 × 5,378.52
4. Step 4: Simplify right side
   9,155.28x = 67,953,297.38
5. Step 5: Solve for x
   x = 67,953,297.38/9,155.28
6. Step 6: Final answer
   x = 7,422.31