Finding the Fourth Proportional to 1,909.12, 2,635.06 and 1,123.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,909.12 : 2,635.06 = 1,123.70 : x
2. Step 2: Convert to fraction form
   1,909.12/2,635.06 = 1,123.70/x
3. Step 3: Cross multiply
   1,909.12x = 2,635.06 × 1,123.70
4. Step 4: Simplify right side
   1,909.12x = 2,961,016.92
5. Step 5: Solve for x
   x = 2,961,016.92/1,909.12
6. Step 6: Final answer
   x = 1,550.99