Finding the Fourth Proportional to 1,825.60, 2,520.72 and 1,405.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,825.60 : 2,520.72 = 1,405.30 : x
2. Step 2: Convert to fraction form
   1,825.60/2,520.72 = 1,405.30/x
3. Step 3: Cross multiply
   1,825.60x = 2,520.72 × 1,405.30
4. Step 4: Simplify right side
   1,825.60x = 3,542,367.82
5. Step 5: Solve for x
   x = 3,542,367.82/1,825.60
6. Step 6: Final answer
   x = 1,940.39