Finding the Fourth Proportional to 1,080.37, 1,620.42 and 300.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.37 : 1,620.42 = 300.43 : x
2. Step 2: Convert to fraction form
   1,080.37/1,620.42 = 300.43/x
3. Step 3: Cross multiply
   1,080.37x = 1,620.42 × 300.43
4. Step 4: Simplify right side
   1,080.37x = 486,822.78
5. Step 5: Solve for x
   x = 486,822.78/1,080.37
6. Step 6: Final answer
   x = 450.61