Finding the Fourth Proportional to 3,315.76, 4,971.81 and 1,123.63

Step by Step Solution

1. Step 1: Write the proportion equation
   3,315.76 : 4,971.81 = 1,123.63 : x
2. Step 2: Convert to fraction form
   3,315.76/4,971.81 = 1,123.63/x
3. Step 3: Cross multiply
   3,315.76x = 4,971.81 × 1,123.63
4. Step 4: Simplify right side
   3,315.76x = 5,586,466.65
5. Step 5: Solve for x
   x = 5,586,466.65/3,315.76
6. Step 6: Final answer
   x = 1,684.82