Finding the Fourth Proportional to 12,743.60, 17,590.20 and 7,440.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,743.60 : 17,590.20 = 7,440.56 : x
2. Step 2: Convert to fraction form
   12,743.60/17,590.20 = 7,440.56/x
3. Step 3: Cross multiply
   12,743.60x = 17,590.20 × 7,440.56
4. Step 4: Simplify right side
   12,743.60x = 130,880,938.51
5. Step 5: Solve for x
   x = 130,880,938.51/12,743.60
6. Step 6: Final answer
   x = 10,270.33