Finding the Fourth Proportional to 2,515.78, 3,772.86 and 1,199.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,515.78 : 3,772.86 = 1,199.40 : x
2. Step 2: Convert to fraction form
   2,515.78/3,772.86 = 1,199.40/x
3. Step 3: Cross multiply
   2,515.78x = 3,772.86 × 1,199.40
4. Step 4: Simplify right side
   2,515.78x = 4,525,168.28
5. Step 5: Solve for x
   x = 4,525,168.28/2,515.78
6. Step 6: Final answer
   x = 1,798.71