Finding the Fourth Proportional to 2,290.24, 3,160.80 and 1,405.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.24 : 3,160.80 = 1,405.72 : x
2. Step 2: Convert to fraction form
   2,290.24/3,160.80 = 1,405.72/x
3. Step 3: Cross multiply
   2,290.24x = 3,160.80 × 1,405.72
4. Step 4: Simplify right side
   2,290.24x = 4,443,199.78
5. Step 5: Solve for x
   x = 4,443,199.78/2,290.24
6. Step 6: Final answer
   x = 1,940.06