Finding the Fourth Proportional to 1,611.16, 2,223.46 and 912.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,611.16 : 2,223.46 = 912.52 : x
2. Step 2: Convert to fraction form
   1,611.16/2,223.46 = 912.52/x
3. Step 3: Cross multiply
   1,611.16x = 2,223.46 × 912.52
4. Step 4: Simplify right side
   1,611.16x = 2,028,951.72
5. Step 5: Solve for x
   x = 2,028,951.72/1,611.16
6. Step 6: Final answer
   x = 1,259.31