Finding the Fourth Proportional to 9,389.34, 12,957.30 and 5,197.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,389.34 : 12,957.30 = 5,197.50 : x
2. Step 2: Convert to fraction form
   9,389.34/12,957.30 = 5,197.50/x
3. Step 3: Cross multiply
   9,389.34x = 12,957.30 × 5,197.50
4. Step 4: Simplify right side
   9,389.34x = 67,345,566.75
5. Step 5: Solve for x
   x = 67,345,566.75/9,389.34
6. Step 6: Final answer
   x = 7,172.56