Finding the Fourth Proportional to 9,390.90, 12,957.32 and 5,613.44

Step by Step Solution

1. Step 1: Write the proportion equation
   9,390.90 : 12,957.32 = 5,613.44 : x
2. Step 2: Convert to fraction form
   9,390.90/12,957.32 = 5,613.44/x
3. Step 3: Cross multiply
   9,390.90x = 12,957.32 × 5,613.44
4. Step 4: Simplify right side
   9,390.90x = 72,735,045.53
5. Step 5: Solve for x
   x = 72,735,045.53/9,390.90
6. Step 6: Final answer
   x = 7,745.27