Finding the Fourth Proportional to 1,145.76, 1,589.01 and 1,074.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.76 : 1,589.01 = 1,074.48 : x
2. Step 2: Convert to fraction form
   1,145.76/1,589.01 = 1,074.48/x
3. Step 3: Cross multiply
   1,145.76x = 1,589.01 × 1,074.48
4. Step 4: Simplify right side
   1,145.76x = 1,707,359.46
5. Step 5: Solve for x
   x = 1,707,359.46/1,145.76
6. Step 6: Final answer
   x = 1,490.15