Finding the Fourth Proportional to 2,259.94, 3,111.78 and 1,978.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,259.94 : 3,111.78 = 1,978.60 : x
2. Step 2: Convert to fraction form
   2,259.94/3,111.78 = 1,978.60/x
3. Step 3: Cross multiply
   2,259.94x = 3,111.78 × 1,978.60
4. Step 4: Simplify right side
   2,259.94x = 6,156,967.91
5. Step 5: Solve for x
   x = 6,156,967.91/2,259.94
6. Step 6: Final answer
   x = 2,724.39