Finding the Fourth Proportional to 2,040.72, 3,060.72 and 579.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,040.72 : 3,060.72 = 579.96 : x
2. Step 2: Convert to fraction form
   2,040.72/3,060.72 = 579.96/x
3. Step 3: Cross multiply
   2,040.72x = 3,060.72 × 579.96
4. Step 4: Simplify right side
   2,040.72x = 1,775,095.17
5. Step 5: Solve for x
   x = 1,775,095.17/2,040.72
6. Step 6: Final answer
   x = 869.84