Finding the Fourth Proportional to 2,111.80, 3,166.12 and 1,015.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.80 : 3,166.12 = 1,015.12 : x
2. Step 2: Convert to fraction form
   2,111.80/3,166.12 = 1,015.12/x
3. Step 3: Cross multiply
   2,111.80x = 3,166.12 × 1,015.12
4. Step 4: Simplify right side
   2,111.80x = 3,213,991.73
5. Step 5: Solve for x
   x = 3,213,991.73/2,111.80
6. Step 6: Final answer
   x = 1,521.92