Finding the Fourth Proportional to 1,812.57, 2,503.41 and 1,282.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,812.57 : 2,503.41 = 1,282.78 : x
2. Step 2: Convert to fraction form
   1,812.57/2,503.41 = 1,282.78/x
3. Step 3: Cross multiply
   1,812.57x = 2,503.41 × 1,282.78
4. Step 4: Simplify right side
   1,812.57x = 3,211,322.60
5. Step 5: Solve for x
   x = 3,211,322.60/1,812.57
6. Step 6: Final answer
   x = 1,771.70