Finding the Fourth Proportional to 9,158.56, 12,639.74 and 5,573.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,158.56 : 12,639.74 = 5,573.78 : x
2. Step 2: Convert to fraction form
   9,158.56/12,639.74 = 5,573.78/x
3. Step 3: Cross multiply
   9,158.56x = 12,639.74 × 5,573.78
4. Step 4: Simplify right side
   9,158.56x = 70,451,130.02
5. Step 5: Solve for x
   x = 70,451,130.02/9,158.56
6. Step 6: Final answer
   x = 7,692.38