Finding the Fourth Proportional to 13,721.42, 18,935.52 and 7,433.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,721.42 : 18,935.52 = 7,433.78 : x
2. Step 2: Convert to fraction form
   13,721.42/18,935.52 = 7,433.78/x
3. Step 3: Cross multiply
   13,721.42x = 18,935.52 × 7,433.78
4. Step 4: Simplify right side
   13,721.42x = 140,762,489.87
5. Step 5: Solve for x
   x = 140,762,489.87/13,721.42
6. Step 6: Final answer
   x = 10,258.59