Finding the Fourth Proportional to 2,865.78, 4,300.23 and 1,326.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,865.78 : 4,300.23 = 1,326.78 : x
2. Step 2: Convert to fraction form
   2,865.78/4,300.23 = 1,326.78/x
3. Step 3: Cross multiply
   2,865.78x = 4,300.23 × 1,326.78
4. Step 4: Simplify right side
   2,865.78x = 5,705,459.16
5. Step 5: Solve for x
   x = 5,705,459.16/2,865.78
6. Step 6: Final answer
   x = 1,990.89