Finding the Fourth Proportional to 2,978.67, 4,111.89 and 1,859.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.67 : 4,111.89 = 1,859.40 : x
2. Step 2: Convert to fraction form
   2,978.67/4,111.89 = 1,859.40/x
3. Step 3: Cross multiply
   2,978.67x = 4,111.89 × 1,859.40
4. Step 4: Simplify right side
   2,978.67x = 7,645,648.27
5. Step 5: Solve for x
   x = 7,645,648.27/2,978.67
6. Step 6: Final answer
   x = 2,566.80