Finding the Fourth Proportional to 4,880.40, 7,290.94 and 3,111.31

Step by Step Solution

1. Step 1: Write the proportion equation
   4,880.40 : 7,290.94 = 3,111.31 : x
2. Step 2: Convert to fraction form
   4,880.40/7,290.94 = 3,111.31/x
3. Step 3: Cross multiply
   4,880.40x = 7,290.94 × 3,111.31
4. Step 4: Simplify right side
   4,880.40x = 22,684,372.95
5. Step 5: Solve for x
   x = 22,684,372.95/4,880.40
6. Step 6: Final answer
   x = 4,648.05