Finding the Fourth Proportional to 1,330.77, 1,982.78 and 1,256.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,330.77 : 1,982.78 = 1,256.25 : x
2. Step 2: Convert to fraction form
   1,330.77/1,982.78 = 1,256.25/x
3. Step 3: Cross multiply
   1,330.77x = 1,982.78 × 1,256.25
4. Step 4: Simplify right side
   1,330.77x = 2,490,870.52
5. Step 5: Solve for x
   x = 2,490,870.52/1,330.77
6. Step 6: Final answer
   x = 1,871.75