Finding the Fourth Proportional to 1,404.24, 1,938.24 and 1,285.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.24 : 1,938.24 = 1,285.20 : x
2. Step 2: Convert to fraction form
   1,404.24/1,938.24 = 1,285.20/x
3. Step 3: Cross multiply
   1,404.24x = 1,938.24 × 1,285.20
4. Step 4: Simplify right side
   1,404.24x = 2,491,026.05
5. Step 5: Solve for x
   x = 2,491,026.05/1,404.24
6. Step 6: Final answer
   x = 1,773.93