Finding the Fourth Proportional to 2,259.81, 3,111.62 and 1,978.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,259.81 : 3,111.62 = 1,978.47 : x
2. Step 2: Convert to fraction form
   2,259.81/3,111.62 = 1,978.47/x
3. Step 3: Cross multiply
   2,259.81x = 3,111.62 × 1,978.47
4. Step 4: Simplify right side
   2,259.81x = 6,156,236.93
5. Step 5: Solve for x
   x = 6,156,236.93/2,259.81
6. Step 6: Final answer
   x = 2,724.23