Finding the Fourth Proportional to 14,016.78, 19,342.80 and 7,728.75

Step by Step Solution

1. Step 1: Write the proportion equation
   14,016.78 : 19,342.80 = 7,728.75 : x
2. Step 2: Convert to fraction form
   14,016.78/19,342.80 = 7,728.75/x
3. Step 3: Cross multiply
   14,016.78x = 19,342.80 × 7,728.75
4. Step 4: Simplify right side
   14,016.78x = 149,495,665.50
5. Step 5: Solve for x
   x = 149,495,665.50/14,016.78
6. Step 6: Final answer
   x = 10,665.48