Finding the Fourth Proportional to 14,128.48, 19,497.12 and 7,840.72

Step by Step Solution

1. Step 1: Write the proportion equation
   14,128.48 : 19,497.12 = 7,840.72 : x
2. Step 2: Convert to fraction form
   14,128.48/19,497.12 = 7,840.72/x
3. Step 3: Cross multiply
   14,128.48x = 19,497.12 × 7,840.72
4. Step 4: Simplify right side
   14,128.48x = 152,871,458.73
5. Step 5: Solve for x
   x = 152,871,458.73/14,128.48
6. Step 6: Final answer
   x = 10,820.09