Finding the Fourth Proportional to 2,298.78, 3,171.45 and 2,061.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,298.78 : 3,171.45 = 2,061.55 : x
2. Step 2: Convert to fraction form
   2,298.78/3,171.45 = 2,061.55/x
3. Step 3: Cross multiply
   2,298.78x = 3,171.45 × 2,061.55
4. Step 4: Simplify right side
   2,298.78x = 6,538,114.44
5. Step 5: Solve for x
   x = 6,538,114.44/2,298.78
6. Step 6: Final answer
   x = 2,844.17