Finding the Fourth Proportional to 2,978.78, 4,111.52 and 1,859.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.78 : 4,111.52 = 1,859.04 : x
2. Step 2: Convert to fraction form
   2,978.78/4,111.52 = 1,859.04/x
3. Step 3: Cross multiply
   2,978.78x = 4,111.52 × 1,859.04
4. Step 4: Simplify right side
   2,978.78x = 7,643,470.85
5. Step 5: Solve for x
   x = 7,643,470.85/2,978.78
6. Step 6: Final answer
   x = 2,565.98