Finding the Fourth Proportional to 2,978.72, 4,107.94 and 1,859.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.72 : 4,107.94 = 1,859.76 : x
2. Step 2: Convert to fraction form
   2,978.72/4,107.94 = 1,859.76/x
3. Step 3: Cross multiply
   2,978.72x = 4,107.94 × 1,859.76
4. Step 4: Simplify right side
   2,978.72x = 7,639,782.49
5. Step 5: Solve for x
   x = 7,639,782.49/2,978.72
6. Step 6: Final answer
   x = 2,564.79