Finding the Fourth Proportional to 2,108.42, 3,161.12 and 1,515.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,108.42 : 3,161.12 = 1,515.78 : x
2. Step 2: Convert to fraction form
   2,108.42/3,161.12 = 1,515.78/x
3. Step 3: Cross multiply
   2,108.42x = 3,161.12 × 1,515.78
4. Step 4: Simplify right side
   2,108.42x = 4,791,554.89
5. Step 5: Solve for x
   x = 4,791,554.89/2,108.42
6. Step 6: Final answer
   x = 2,272.59