Finding the Fourth Proportional to 1,601.76, 2,209.50 and 1,207.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,601.76 : 2,209.50 = 1,207.56 : x
2. Step 2: Convert to fraction form
   1,601.76/2,209.50 = 1,207.56/x
3. Step 3: Cross multiply
   1,601.76x = 2,209.50 × 1,207.56
4. Step 4: Simplify right side
   1,601.76x = 2,668,103.82
5. Step 5: Solve for x
   x = 2,668,103.82/1,601.76
6. Step 6: Final answer
   x = 1,665.73