Finding the Fourth Proportional to 5,111.27, 7,665.29 and 2,188.79

Step by Step Solution

1. Step 1: Write the proportion equation
   5,111.27 : 7,665.29 = 2,188.79 : x
2. Step 2: Convert to fraction form
   5,111.27/7,665.29 = 2,188.79/x
3. Step 3: Cross multiply
   5,111.27x = 7,665.29 × 2,188.79
4. Step 4: Simplify right side
   5,111.27x = 16,777,699.16
5. Step 5: Solve for x
   x = 16,777,699.16/5,111.27
6. Step 6: Final answer
   x = 3,282.49