Finding the Fourth Proportional to 5,111.71, 7,669.08 and 2,648.30

Step by Step Solution

1. Step 1: Write the proportion equation
   5,111.71 : 7,669.08 = 2,648.30 : x
2. Step 2: Convert to fraction form
   5,111.71/7,669.08 = 2,648.30/x
3. Step 3: Cross multiply
   5,111.71x = 7,669.08 × 2,648.30
4. Step 4: Simplify right side
   5,111.71x = 20,309,986.22
5. Step 5: Solve for x
   x = 20,309,986.22/5,111.71
6. Step 6: Final answer
   x = 3,973.23