Finding the Fourth Proportional to 1,399.12, 1,929.84 and 1,306.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.12 : 1,929.84 = 1,306.24 : x
2. Step 2: Convert to fraction form
   1,399.12/1,929.84 = 1,306.24/x
3. Step 3: Cross multiply
   1,399.12x = 1,929.84 × 1,306.24
4. Step 4: Simplify right side
   1,399.12x = 2,520,834.20
5. Step 5: Solve for x
   x = 2,520,834.20/1,399.12
6. Step 6: Final answer
   x = 1,801.73