Finding the Fourth Proportional to 10,928.20, 16,386.54 and 4,765

Step by Step Solution

1. Step 1: Write the proportion equation
   10,928.20 : 16,386.54 = 4,765 : x
2. Step 2: Convert to fraction form
   10,928.20/16,386.54 = 4,765/x
3. Step 3: Cross multiply
   10,928.20x = 16,386.54 × 4,765
4. Step 4: Simplify right side
   10,928.20x = 78,081,863.10
5. Step 5: Solve for x
   x = 78,081,863.10/10,928.20
6. Step 6: Final answer
   x = 7,144.99