Finding the Fourth Proportional to 3,762.42, 5,643.18 and 989.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,762.42 : 5,643.18 = 989.31 : x
2. Step 2: Convert to fraction form
   3,762.42/5,643.18 = 989.31/x
3. Step 3: Cross multiply
   3,762.42x = 5,643.18 × 989.31
4. Step 4: Simplify right side
   3,762.42x = 5,582,838.37
5. Step 5: Solve for x
   x = 5,582,838.37/3,762.42
6. Step 6: Final answer
   x = 1,483.84