Finding the Fourth Proportional to 1,870.48, 2,585.28 and 1,403.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.48 : 2,585.28 = 1,403.92 : x
2. Step 2: Convert to fraction form
   1,870.48/2,585.28 = 1,403.92/x
3. Step 3: Cross multiply
   1,870.48x = 2,585.28 × 1,403.92
4. Step 4: Simplify right side
   1,870.48x = 3,629,526.30
5. Step 5: Solve for x
   x = 3,629,526.30/1,870.48
6. Step 6: Final answer
   x = 1,940.43