Finding the Fourth Proportional to 2,101.57, 2,900.17 and 1,217.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.57 : 2,900.17 = 1,217.54 : x
2. Step 2: Convert to fraction form
   2,101.57/2,900.17 = 1,217.54/x
3. Step 3: Cross multiply
   2,101.57x = 2,900.17 × 1,217.54
4. Step 4: Simplify right side
   2,101.57x = 3,531,080.70
5. Step 5: Solve for x
   x = 3,531,080.70/2,101.57
6. Step 6: Final answer
   x = 1,680.21