Finding the Fourth Proportional to 2,979.78, 4,111.38 and 1,860.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,979.78 : 4,111.38 = 1,860.32 : x
2. Step 2: Convert to fraction form
   2,979.78/4,111.38 = 1,860.32/x
3. Step 3: Cross multiply
   2,979.78x = 4,111.38 × 1,860.32
4. Step 4: Simplify right side
   2,979.78x = 7,648,461.88
5. Step 5: Solve for x
   x = 7,648,461.88/2,979.78
6. Step 6: Final answer
   x = 2,566.79