Finding the Fourth Proportional to 1,146.33, 1,580.61 and 909.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,146.33 : 1,580.61 = 909.81 : x
2. Step 2: Convert to fraction form
   1,146.33/1,580.61 = 909.81/x
3. Step 3: Cross multiply
   1,146.33x = 1,580.61 × 909.81
4. Step 4: Simplify right side
   1,146.33x = 1,438,054.78
5. Step 5: Solve for x
   x = 1,438,054.78/1,146.33
6. Step 6: Final answer
   x = 1,254.49