Finding the Fourth Proportional to 1,145.30, 1,582.35 and 1,057.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.30 : 1,582.35 = 1,057.82 : x
2. Step 2: Convert to fraction form
   1,145.30/1,582.35 = 1,057.82/x
3. Step 3: Cross multiply
   1,145.30x = 1,582.35 × 1,057.82
4. Step 4: Simplify right side
   1,145.30x = 1,673,841.48
5. Step 5: Solve for x
   x = 1,673,841.48/1,145.30
6. Step 6: Final answer
   x = 1,461.49