Finding the Fourth Proportional to 1,145.42, 1,580.16 and 909.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.42 : 1,580.16 = 909.46 : x
2. Step 2: Convert to fraction form
   1,145.42/1,580.16 = 909.46/x
3. Step 3: Cross multiply
   1,145.42x = 1,580.16 × 909.46
4. Step 4: Simplify right side
   1,145.42x = 1,437,092.31
5. Step 5: Solve for x
   x = 1,437,092.31/1,145.42
6. Step 6: Final answer
   x = 1,254.64