Finding the Fourth Proportional to 13,242.28, 19,871.79 and 7,402.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,242.28 : 19,871.79 = 7,402.72 : x
2. Step 2: Convert to fraction form
   13,242.28/19,871.79 = 7,402.72/x
3. Step 3: Cross multiply
   13,242.28x = 19,871.79 × 7,402.72
4. Step 4: Simplify right side
   13,242.28x = 147,105,297.27
5. Step 5: Solve for x
   x = 147,105,297.27/13,242.28
6. Step 6: Final answer
   x = 11,108.76