Finding the Fourth Proportional to 1,139.30, 1,569.79 and 1,063.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.30 : 1,569.79 = 1,063.10 : x
2. Step 2: Convert to fraction form
   1,139.30/1,569.79 = 1,063.10/x
3. Step 3: Cross multiply
   1,139.30x = 1,569.79 × 1,063.10
4. Step 4: Simplify right side
   1,139.30x = 1,668,843.75
5. Step 5: Solve for x
   x = 1,668,843.75/1,139.30
6. Step 6: Final answer
   x = 1,464.80