Finding the Fourth Proportional to 3,315.42, 4,972.80 and 1,123.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,315.42 : 4,972.80 = 1,123.89 : x
2. Step 2: Convert to fraction form
   3,315.42/4,972.80 = 1,123.89/x
3. Step 3: Cross multiply
   3,315.42x = 4,972.80 × 1,123.89
4. Step 4: Simplify right side
   3,315.42x = 5,588,855.33
5. Step 5: Solve for x
   x = 5,588,855.33/3,315.42
6. Step 6: Final answer
   x = 1,685.72