Finding the Fourth Proportional to 2,111.37, 3,158.39 and 1,986.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.37 : 3,158.39 = 1,986.98 : x
2. Step 2: Convert to fraction form
   2,111.37/3,158.39 = 1,986.98/x
3. Step 3: Cross multiply
   2,111.37x = 3,158.39 × 1,986.98
4. Step 4: Simplify right side
   2,111.37x = 6,275,664.70
5. Step 5: Solve for x
   x = 6,275,664.70/2,111.37
6. Step 6: Final answer
   x = 2,972.32