Finding the Fourth Proportional to 2,391.99, 3,585.63 and 1,005.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,391.99 : 3,585.63 = 1,005.72 : x
2. Step 2: Convert to fraction form
   2,391.99/3,585.63 = 1,005.72/x
3. Step 3: Cross multiply
   2,391.99x = 3,585.63 × 1,005.72
4. Step 4: Simplify right side
   2,391.99x = 3,606,139.80
5. Step 5: Solve for x
   x = 3,606,139.80/2,391.99
6. Step 6: Final answer
   x = 1,507.59