Finding the Fourth Proportional to 1,217.59, 1,676.59 and 1,020.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,217.59 : 1,676.59 = 1,020.76 : x
2. Step 2: Convert to fraction form
   1,217.59/1,676.59 = 1,020.76/x
3. Step 3: Cross multiply
   1,217.59x = 1,676.59 × 1,020.76
4. Step 4: Simplify right side
   1,217.59x = 1,711,396.01
5. Step 5: Solve for x
   x = 1,711,396.01/1,217.59
6. Step 6: Final answer
   x = 1,405.56