Finding the Fourth Proportional to 13,923.56, 19,211.72 and 7,957.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,923.56 : 19,211.72 = 7,957.20 : x
2. Step 2: Convert to fraction form
   13,923.56/19,211.72 = 7,957.20/x
3. Step 3: Cross multiply
   13,923.56x = 19,211.72 × 7,957.20
4. Step 4: Simplify right side
   13,923.56x = 152,871,498.38
5. Step 5: Solve for x
   x = 152,871,498.38/13,923.56
6. Step 6: Final answer
   x = 10,979.34