Finding the Fourth Proportional to 9,389.06, 12,956.91 and 5,197.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,389.06 : 12,956.91 = 5,197.31 : x
2. Step 2: Convert to fraction form
   9,389.06/12,956.91 = 5,197.31/x
3. Step 3: Cross multiply
   9,389.06x = 12,956.91 × 5,197.31
4. Step 4: Simplify right side
   9,389.06x = 67,341,144.34
5. Step 5: Solve for x
   x = 67,341,144.34/9,389.06
6. Step 6: Final answer
   x = 7,172.30