Finding the Fourth Proportional to 2,985.31, 4,478.78 and 1,255.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,985.31 : 4,478.78 = 1,255.15 : x
2. Step 2: Convert to fraction form
   2,985.31/4,478.78 = 1,255.15/x
3. Step 3: Cross multiply
   2,985.31x = 4,478.78 × 1,255.15
4. Step 4: Simplify right side
   2,985.31x = 5,621,540.72
5. Step 5: Solve for x
   x = 5,621,540.72/2,985.31
6. Step 6: Final answer
   x = 1,883.07