Finding the Fourth Proportional to 1,604.94, 2,215.22 and 906.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,604.94 : 2,215.22 = 906.72 : x
2. Step 2: Convert to fraction form
   1,604.94/2,215.22 = 906.72/x
3. Step 3: Cross multiply
   1,604.94x = 2,215.22 × 906.72
4. Step 4: Simplify right side
   1,604.94x = 2,008,584.28
5. Step 5: Solve for x
   x = 2,008,584.28/1,604.94
6. Step 6: Final answer
   x = 1,251.50