Finding the Fourth Proportional to 3,428.52, 5,142.76 and 1,120

Step by Step Solution

1. Step 1: Write the proportion equation
   3,428.52 : 5,142.76 = 1,120 : x
2. Step 2: Convert to fraction form
   3,428.52/5,142.76 = 1,120/x
3. Step 3: Cross multiply
   3,428.52x = 5,142.76 × 1,120
4. Step 4: Simplify right side
   3,428.52x = 5,759,891.20
5. Step 5: Solve for x
   x = 5,759,891.20/3,428.52
6. Step 6: Final answer
   x = 1,679.99