Finding the Fourth Proportional to 1,488.24, 2,055.72 and 1,140.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.24 : 2,055.72 = 1,140.72 : x
2. Step 2: Convert to fraction form
   1,488.24/2,055.72 = 1,140.72/x
3. Step 3: Cross multiply
   1,488.24x = 2,055.72 × 1,140.72
4. Step 4: Simplify right side
   1,488.24x = 2,345,000.92
5. Step 5: Solve for x
   x = 2,345,000.92/1,488.24
6. Step 6: Final answer
   x = 1,575.69