Finding the Fourth Proportional to 1,142.46, 1,575.54 and 1,057.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.46 : 1,575.54 = 1,057.62 : x
2. Step 2: Convert to fraction form
   1,142.46/1,575.54 = 1,057.62/x
3. Step 3: Cross multiply
   1,142.46x = 1,575.54 × 1,057.62
4. Step 4: Simplify right side
   1,142.46x = 1,666,322.61
5. Step 5: Solve for x
   x = 1,666,322.61/1,142.46
6. Step 6: Final answer
   x = 1,458.54