Finding the Fourth Proportional to 2,101.55, 2,900.30 and 1,217.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.55 : 2,900.30 = 1,217.34 : x
2. Step 2: Convert to fraction form
   2,101.55/2,900.30 = 1,217.34/x
3. Step 3: Cross multiply
   2,101.55x = 2,900.30 × 1,217.34
4. Step 4: Simplify right side
   2,101.55x = 3,530,645.12
5. Step 5: Solve for x
   x = 3,530,645.12/2,101.55
6. Step 6: Final answer
   x = 1,680.02