Finding the Fourth Proportional to 9,389.38, 12,957.35 and 5,140.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,389.38 : 12,957.35 = 5,140.72 : x
2. Step 2: Convert to fraction form
   9,389.38/12,957.35 = 5,140.72/x
3. Step 3: Cross multiply
   9,389.38x = 12,957.35 × 5,140.72
4. Step 4: Simplify right side
   9,389.38x = 66,610,123.94
5. Step 5: Solve for x
   x = 66,610,123.94/9,389.38
6. Step 6: Final answer
   x = 7,094.20