Finding the Fourth Proportional to 2,814.78, 4,219.89 and 1,172.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,814.78 : 4,219.89 = 1,172.55 : x
2. Step 2: Convert to fraction form
   2,814.78/4,219.89 = 1,172.55/x
3. Step 3: Cross multiply
   2,814.78x = 4,219.89 × 1,172.55
4. Step 4: Simplify right side
   2,814.78x = 4,948,032.02
5. Step 5: Solve for x
   x = 4,948,032.02/2,814.78
6. Step 6: Final answer
   x = 1,757.88