Finding the Fourth Proportional to 3,071.80, 4,607.72 and 1,123.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,071.80 : 4,607.72 = 1,123.20 : x
2. Step 2: Convert to fraction form
   3,071.80/4,607.72 = 1,123.20/x
3. Step 3: Cross multiply
   3,071.80x = 4,607.72 × 1,123.20
4. Step 4: Simplify right side
   3,071.80x = 5,175,391.10
5. Step 5: Solve for x
   x = 5,175,391.10/3,071.80
6. Step 6: Final answer
   x = 1,684.81