Finding the Fourth Proportional to 9,391.74, 12,960.20 and 5,142.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,391.74 : 12,960.20 = 5,142.72 : x
2. Step 2: Convert to fraction form
   9,391.74/12,960.20 = 5,142.72/x
3. Step 3: Cross multiply
   9,391.74x = 12,960.20 × 5,142.72
4. Step 4: Simplify right side
   9,391.74x = 66,650,699.29
5. Step 5: Solve for x
   x = 66,650,699.29/9,391.74
6. Step 6: Final answer
   x = 7,096.74