Finding the Fourth Proportional to 13,574.72, 18,732.56 and 7,909.76

Step by Step Solution

1. Step 1: Write the proportion equation
   13,574.72 : 18,732.56 = 7,909.76 : x
2. Step 2: Convert to fraction form
   13,574.72/18,732.56 = 7,909.76/x
3. Step 3: Cross multiply
   13,574.72x = 18,732.56 × 7,909.76
4. Step 4: Simplify right side
   13,574.72x = 148,170,053.79
5. Step 5: Solve for x
   x = 148,170,053.79/13,574.72
6. Step 6: Final answer
   x = 10,915.15