Finding the Fourth Proportional to 2,042.31, 3,064.62 and 872.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,042.31 : 3,064.62 = 872.20 : x
2. Step 2: Convert to fraction form
   2,042.31/3,064.62 = 872.20/x
3. Step 3: Cross multiply
   2,042.31x = 3,064.62 × 872.20
4. Step 4: Simplify right side
   2,042.31x = 2,672,961.56
5. Step 5: Solve for x
   x = 2,672,961.56/2,042.31
6. Step 6: Final answer
   x = 1,308.79