Finding the Fourth Proportional to 1,909.58, 2,635.20 and 1,123.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,909.58 : 2,635.20 = 1,123.61 : x
2. Step 2: Convert to fraction form
   1,909.58/2,635.20 = 1,123.61/x
3. Step 3: Cross multiply
   1,909.58x = 2,635.20 × 1,123.61
4. Step 4: Simplify right side
   1,909.58x = 2,960,923.90
5. Step 5: Solve for x
   x = 2,960,923.90/1,909.58
6. Step 6: Final answer
   x = 1,550.57