Finding the Fourth Proportional to 2,108.80, 3,161.62 and 1,012.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,108.80 : 3,161.62 = 1,012.12 : x
2. Step 2: Convert to fraction form
   2,108.80/3,161.62 = 1,012.12/x
3. Step 3: Cross multiply
   2,108.80x = 3,161.62 × 1,012.12
4. Step 4: Simplify right side
   2,108.80x = 3,199,938.83
5. Step 5: Solve for x
   x = 3,199,938.83/2,108.80
6. Step 6: Final answer
   x = 1,517.42