Finding the Fourth Proportional to 3,581.42, 5,369.69 and 1,387.60

Step by Step Solution

1. Step 1: Write the proportion equation
   3,581.42 : 5,369.69 = 1,387.60 : x
2. Step 2: Convert to fraction form
   3,581.42/5,369.69 = 1,387.60/x
3. Step 3: Cross multiply
   3,581.42x = 5,369.69 × 1,387.60
4. Step 4: Simplify right side
   3,581.42x = 7,450,971.89
5. Step 5: Solve for x
   x = 7,450,971.89/3,581.42
6. Step 6: Final answer
   x = 2,080.45