Finding the Fourth Proportional to 3,820.78, 5,272.94 and 2,142.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,820.78 : 5,272.94 = 2,142.50 : x
2. Step 2: Convert to fraction form
   3,820.78/5,272.94 = 2,142.50/x
3. Step 3: Cross multiply
   3,820.78x = 5,272.94 × 2,142.50
4. Step 4: Simplify right side
   3,820.78x = 11,297,273.95
5. Step 5: Solve for x
   x = 11,297,273.95/3,820.78
6. Step 6: Final answer
   x = 2,956.80