Finding the Fourth Proportional to 1,357.30, 1,871.52 and 1,107.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.30 : 1,871.52 = 1,107.85 : x
2. Step 2: Convert to fraction form
   1,357.30/1,871.52 = 1,107.85/x
3. Step 3: Cross multiply
   1,357.30x = 1,871.52 × 1,107.85
4. Step 4: Simplify right side
   1,357.30x = 2,073,363.43
5. Step 5: Solve for x
   x = 2,073,363.43/1,357.30
6. Step 6: Final answer
   x = 1,527.56