Finding the Fourth Proportional to 10,728.06, 14,789.46 and 7,890.42

Step by Step Solution

1. Step 1: Write the proportion equation
   10,728.06 : 14,789.46 = 7,890.42 : x
2. Step 2: Convert to fraction form
   10,728.06/14,789.46 = 7,890.42/x
3. Step 3: Cross multiply
   10,728.06x = 14,789.46 × 7,890.42
4. Step 4: Simplify right side
   10,728.06x = 116,695,050.97
5. Step 5: Solve for x
   x = 116,695,050.97/10,728.06
6. Step 6: Final answer
   x = 10,877.55