Finding the Fourth Proportional to 2,955.30, 4,431.59 and 874.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,955.30 : 4,431.59 = 874.56 : x
2. Step 2: Convert to fraction form
   2,955.30/4,431.59 = 874.56/x
3. Step 3: Cross multiply
   2,955.30x = 4,431.59 × 874.56
4. Step 4: Simplify right side
   2,955.30x = 3,875,686.98
5. Step 5: Solve for x
   x = 3,875,686.98/2,955.30
6. Step 6: Final answer
   x = 1,311.44