Finding the Fourth Proportional to 3,431.68, 5,148.06 and 1,123

Step by Step Solution

1. Step 1: Write the proportion equation
   3,431.68 : 5,148.06 = 1,123 : x
2. Step 2: Convert to fraction form
   3,431.68/5,148.06 = 1,123/x
3. Step 3: Cross multiply
   3,431.68x = 5,148.06 × 1,123
4. Step 4: Simplify right side
   3,431.68x = 5,781,271.38
5. Step 5: Solve for x
   x = 5,781,271.38/3,431.68
6. Step 6: Final answer
   x = 1,684.68