Finding the Fourth Proportional to 1,441.50, 1,988.01 and 909.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,441.50 : 1,988.01 = 909.78 : x
2. Step 2: Convert to fraction form
   1,441.50/1,988.01 = 909.78/x
3. Step 3: Cross multiply
   1,441.50x = 1,988.01 × 909.78
4. Step 4: Simplify right side
   1,441.50x = 1,808,651.74
5. Step 5: Solve for x
   x = 1,808,651.74/1,441.50
6. Step 6: Final answer
   x = 1,254.70