Finding the Fourth Proportional to 1,611.37, 2,223.61 and 912.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,611.37 : 2,223.61 = 912.61 : x
2. Step 2: Convert to fraction form
   1,611.37/2,223.61 = 912.61/x
3. Step 3: Cross multiply
   1,611.37x = 2,223.61 × 912.61
4. Step 4: Simplify right side
   1,611.37x = 2,029,288.72
5. Step 5: Solve for x
   x = 2,029,288.72/1,611.37
6. Step 6: Final answer
   x = 1,259.36