Finding the Fourth Proportional to 2,120.72, 3,180.74 and 1,024.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,120.72 : 3,180.74 = 1,024.79 : x
2. Step 2: Convert to fraction form
   2,120.72/3,180.74 = 1,024.79/x
3. Step 3: Cross multiply
   2,120.72x = 3,180.74 × 1,024.79
4. Step 4: Simplify right side
   2,120.72x = 3,259,569.52
5. Step 5: Solve for x
   x = 3,259,569.52/2,120.72
6. Step 6: Final answer
   x = 1,537.01