Finding the Fourth Proportional to 1,406.74, 1,940.70 and 909.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,406.74 : 1,940.70 = 909.43 : x
2. Step 2: Convert to fraction form
   1,406.74/1,940.70 = 909.43/x
3. Step 3: Cross multiply
   1,406.74x = 1,940.70 × 909.43
4. Step 4: Simplify right side
   1,406.74x = 1,764,930.80
5. Step 5: Solve for x
   x = 1,764,930.80/1,406.74
6. Step 6: Final answer
   x = 1,254.62