Finding the Fourth Proportional to 5,111.66, 7,665.21 and 3,561.62

Step by Step Solution

1. Step 1: Write the proportion equation
   5,111.66 : 7,665.21 = 3,561.62 : x
2. Step 2: Convert to fraction form
   5,111.66/7,665.21 = 3,561.62/x
3. Step 3: Cross multiply
   5,111.66x = 7,665.21 × 3,561.62
4. Step 4: Simplify right side
   5,111.66x = 27,300,560.01
5. Step 5: Solve for x
   x = 27,300,560.01/5,111.66
6. Step 6: Final answer
   x = 5,340.84