Finding the Fourth Proportional to 3,636.72, 5,455.55 and 1,039.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,636.72 : 5,455.55 = 1,039.72 : x
2. Step 2: Convert to fraction form
   3,636.72/5,455.55 = 1,039.72/x
3. Step 3: Cross multiply
   3,636.72x = 5,455.55 × 1,039.72
4. Step 4: Simplify right side
   3,636.72x = 5,672,244.45
5. Step 5: Solve for x
   x = 5,672,244.45/3,636.72
6. Step 6: Final answer
   x = 1,559.71