Finding the Fourth Proportional to 2,987.78, 4,480.76 and 1,256.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,987.78 : 4,480.76 = 1,256.02 : x
2. Step 2: Convert to fraction form
   2,987.78/4,480.76 = 1,256.02/x
3. Step 3: Cross multiply
   2,987.78x = 4,480.76 × 1,256.02
4. Step 4: Simplify right side
   2,987.78x = 5,627,924.18
5. Step 5: Solve for x
   x = 5,627,924.18/2,987.78
6. Step 6: Final answer
   x = 1,883.65