Finding the Fourth Proportional to 2,405.34, 3,599.64 and 1,665.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,405.34 : 3,599.64 = 1,665.72 : x
2. Step 2: Convert to fraction form
   2,405.34/3,599.64 = 1,665.72/x
3. Step 3: Cross multiply
   2,405.34x = 3,599.64 × 1,665.72
4. Step 4: Simplify right side
   2,405.34x = 5,995,992.34
5. Step 5: Solve for x
   x = 5,995,992.34/2,405.34
6. Step 6: Final answer
   x = 2,492.78