Finding the Fourth Proportional to 3,613.23, 5,422.31 and 1,665.45

Step by Step Solution

1. Step 1: Write the proportion equation
   3,613.23 : 5,422.31 = 1,665.45 : x
2. Step 2: Convert to fraction form
   3,613.23/5,422.31 = 1,665.45/x
3. Step 3: Cross multiply
   3,613.23x = 5,422.31 × 1,665.45
4. Step 4: Simplify right side
   3,613.23x = 9,030,603.91
5. Step 5: Solve for x
   x = 9,030,603.91/3,613.23
6. Step 6: Final answer
   x = 2,499.31