Finding the Fourth Proportional to 2,113.98, 3,168.90 and 1,017.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.98 : 3,168.90 = 1,017.72 : x
2. Step 2: Convert to fraction form
   2,113.98/3,168.90 = 1,017.72/x
3. Step 3: Cross multiply
   2,113.98x = 3,168.90 × 1,017.72
4. Step 4: Simplify right side
   2,113.98x = 3,225,052.91
5. Step 5: Solve for x
   x = 3,225,052.91/2,113.98
6. Step 6: Final answer
   x = 1,525.58