Finding the Fourth Proportional to 9,391.35, 12,946.23 and 7,149.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,391.35 : 12,946.23 = 7,149.31 : x
2. Step 2: Convert to fraction form
   9,391.35/12,946.23 = 7,149.31/x
3. Step 3: Cross multiply
   9,391.35x = 12,946.23 × 7,149.31
4. Step 4: Simplify right side
   9,391.35x = 92,556,611.60
5. Step 5: Solve for x
   x = 92,556,611.60/9,391.35
6. Step 6: Final answer
   x = 9,855.52