Finding the Fourth Proportional to 3,431.76, 5,148.58 and 1,123.24

Step by Step Solution

1. Step 1: Write the proportion equation
   3,431.76 : 5,148.58 = 1,123.24 : x
2. Step 2: Convert to fraction form
   3,431.76/5,148.58 = 1,123.24/x
3. Step 3: Cross multiply
   3,431.76x = 5,148.58 × 1,123.24
4. Step 4: Simplify right side
   3,431.76x = 5,783,091.00
5. Step 5: Solve for x
   x = 5,783,091.00/3,431.76
6. Step 6: Final answer
   x = 1,685.17