Finding the Fourth Proportional to 5,111.28, 7,669.10 and 2,647.83

Step by Step Solution

1. Step 1: Write the proportion equation
   5,111.28 : 7,669.10 = 2,647.83 : x
2. Step 2: Convert to fraction form
   5,111.28/7,669.10 = 2,647.83/x
3. Step 3: Cross multiply
   5,111.28x = 7,669.10 × 2,647.83
4. Step 4: Simplify right side
   5,111.28x = 20,306,459.81
5. Step 5: Solve for x
   x = 20,306,459.81/5,111.28
6. Step 6: Final answer
   x = 3,972.87