Finding the Fourth Proportional to 1,922.40, 2,885.52 and 1,057.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,922.40 : 2,885.52 = 1,057.12 : x
2. Step 2: Convert to fraction form
   1,922.40/2,885.52 = 1,057.12/x
3. Step 3: Cross multiply
   1,922.40x = 2,885.52 × 1,057.12
4. Step 4: Simplify right side
   1,922.40x = 3,050,340.90
5. Step 5: Solve for x
   x = 3,050,340.90/1,922.40
6. Step 6: Final answer
   x = 1,586.74