Finding the Fourth Proportional to 5,553.80, 7,665.54 and 3,665.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,553.80 : 7,665.54 = 3,665.72 : x
2. Step 2: Convert to fraction form
   5,553.80/7,665.54 = 3,665.72/x
3. Step 3: Cross multiply
   5,553.80x = 7,665.54 × 3,665.72
4. Step 4: Simplify right side
   5,553.80x = 28,099,723.29
5. Step 5: Solve for x
   x = 28,099,723.29/5,553.80
6. Step 6: Final answer
   x = 5,059.55