Finding the Fourth Proportional to 10,789.12, 16,189.86 and 4,945.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,789.12 : 16,189.86 = 4,945.78 : x
2. Step 2: Convert to fraction form
   10,789.12/16,189.86 = 4,945.78/x
3. Step 3: Cross multiply
   10,789.12x = 16,189.86 × 4,945.78
4. Step 4: Simplify right side
   10,789.12x = 80,071,485.79
5. Step 5: Solve for x
   x = 80,071,485.79/10,789.12
6. Step 6: Final answer
   x = 7,421.50