Finding the Fourth Proportional to 7,806.38, 10,780.03 and 5,016.78

Step by Step Solution

1. Step 1: Write the proportion equation
   7,806.38 : 10,780.03 = 5,016.78 : x
2. Step 2: Convert to fraction form
   7,806.38/10,780.03 = 5,016.78/x
3. Step 3: Cross multiply
   7,806.38x = 10,780.03 × 5,016.78
4. Step 4: Simplify right side
   7,806.38x = 54,081,038.90
5. Step 5: Solve for x
   x = 54,081,038.90/7,806.38
6. Step 6: Final answer
   x = 6,927.80