Finding the Fourth Proportional to 2,880.50, 4,321.65 and 906.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,880.50 : 4,321.65 = 906.05 : x
2. Step 2: Convert to fraction form
   2,880.50/4,321.65 = 906.05/x
3. Step 3: Cross multiply
   2,880.50x = 4,321.65 × 906.05
4. Step 4: Simplify right side
   2,880.50x = 3,915,609.37
5. Step 5: Solve for x
   x = 3,915,609.37/2,880.50
6. Step 6: Final answer
   x = 1,359.35