Finding the Fourth Proportional to 1,405.60, 1,940.70 and 909.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.60 : 1,940.70 = 909.52 : x
2. Step 2: Convert to fraction form
   1,405.60/1,940.70 = 909.52/x
3. Step 3: Cross multiply
   1,405.60x = 1,940.70 × 909.52
4. Step 4: Simplify right side
   1,405.60x = 1,765,105.46
5. Step 5: Solve for x
   x = 1,765,105.46/1,405.60
6. Step 6: Final answer
   x = 1,255.77