Finding the Fourth Proportional to 3,979.83, 5,492.03 and 2,187.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,979.83 : 5,492.03 = 2,187.31 : x
2. Step 2: Convert to fraction form
   3,979.83/5,492.03 = 2,187.31/x
3. Step 3: Cross multiply
   3,979.83x = 5,492.03 × 2,187.31
4. Step 4: Simplify right side
   3,979.83x = 12,012,779.37
5. Step 5: Solve for x
   x = 12,012,779.37/3,979.83
6. Step 6: Final answer
   x = 3,018.42