Finding the Fourth Proportional to 2,880.57, 4,314.81 and 1,321.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,880.57 : 4,314.81 = 1,321.89 : x
2. Step 2: Convert to fraction form
   2,880.57/4,314.81 = 1,321.89/x
3. Step 3: Cross multiply
   2,880.57x = 4,314.81 × 1,321.89
4. Step 4: Simplify right side
   2,880.57x = 5,703,704.19
5. Step 5: Solve for x
   x = 5,703,704.19/2,880.57
6. Step 6: Final answer
   x = 1,980.06