Finding the Fourth Proportional to 7,085.31, 10,618.71 and 2,920.56

Step by Step Solution

1. Step 1: Write the proportion equation
   7,085.31 : 10,618.71 = 2,920.56 : x
2. Step 2: Convert to fraction form
   7,085.31/10,618.71 = 2,920.56/x
3. Step 3: Cross multiply
   7,085.31x = 10,618.71 × 2,920.56
4. Step 4: Simplify right side
   7,085.31x = 31,012,579.68
5. Step 5: Solve for x
   x = 31,012,579.68/7,085.31
6. Step 6: Final answer
   x = 4,377.03