Finding the Fourth Proportional to 2,605.50, 3,910.07 and 1,145.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,605.50 : 3,910.07 = 1,145.67 : x
2. Step 2: Convert to fraction form
   2,605.50/3,910.07 = 1,145.67/x
3. Step 3: Cross multiply
   2,605.50x = 3,910.07 × 1,145.67
4. Step 4: Simplify right side
   2,605.50x = 4,479,644.17
5. Step 5: Solve for x
   x = 4,479,644.17/2,605.50
6. Step 6: Final answer
   x = 1,719.31