Finding the Fourth Proportional to 9,391.43, 12,960.80 and 5,412.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,391.43 : 12,960.80 = 5,412.80 : x
2. Step 2: Convert to fraction form
   9,391.43/12,960.80 = 5,412.80/x
3. Step 3: Cross multiply
   9,391.43x = 12,960.80 × 5,412.80
4. Step 4: Simplify right side
   9,391.43x = 70,154,126.37
5. Step 5: Solve for x
   x = 70,154,126.37/9,391.43
6. Step 6: Final answer
   x = 7,470.02