Finding the Fourth Proportional to 2,101.57, 2,899.81 and 1,217.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.57 : 2,899.81 = 1,217.22 : x
2. Step 2: Convert to fraction form
   2,101.57/2,899.81 = 1,217.22/x
3. Step 3: Cross multiply
   2,101.57x = 2,899.81 × 1,217.22
4. Step 4: Simplify right side
   2,101.57x = 3,529,706.73
5. Step 5: Solve for x
   x = 3,529,706.73/2,101.57
6. Step 6: Final answer
   x = 1,679.56