Finding the Fourth Proportional to 3,613.61, 5,422.34 and 1,665.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,613.61 : 5,422.34 = 1,665.56 : x
2. Step 2: Convert to fraction form
   3,613.61/5,422.34 = 1,665.56/x
3. Step 3: Cross multiply
   3,613.61x = 5,422.34 × 1,665.56
4. Step 4: Simplify right side
   3,613.61x = 9,031,250.33
5. Step 5: Solve for x
   x = 9,031,250.33/3,613.61
6. Step 6: Final answer
   x = 2,499.23