Finding the Fourth Proportional to 9,225.79, 12,728.55 and 5,245.45

Step by Step Solution

1. Step 1: Write the proportion equation
   9,225.79 : 12,728.55 = 5,245.45 : x
2. Step 2: Convert to fraction form
   9,225.79/12,728.55 = 5,245.45/x
3. Step 3: Cross multiply
   9,225.79x = 12,728.55 × 5,245.45
4. Step 4: Simplify right side
   9,225.79x = 66,766,972.60
5. Step 5: Solve for x
   x = 66,766,972.60/9,225.79
6. Step 6: Final answer
   x = 7,236.99