Finding the Fourth Proportional to 1,620.72, 2,429.92 and 754.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,620.72 : 2,429.92 = 754.56 : x
2. Step 2: Convert to fraction form
   1,620.72/2,429.92 = 754.56/x
3. Step 3: Cross multiply
   1,620.72x = 2,429.92 × 754.56
4. Step 4: Simplify right side
   1,620.72x = 1,833,520.44
5. Step 5: Solve for x
   x = 1,833,520.44/1,620.72
6. Step 6: Final answer
   x = 1,131.30