Finding the Fourth Proportional to 1,605.32, 2,215.37 and 906.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.32 : 2,215.37 = 906.69 : x
2. Step 2: Convert to fraction form
   1,605.32/2,215.37 = 906.69/x
3. Step 3: Cross multiply
   1,605.32x = 2,215.37 × 906.69
4. Step 4: Simplify right side
   1,605.32x = 2,008,649.29
5. Step 5: Solve for x
   x = 2,008,649.29/1,605.32
6. Step 6: Final answer
   x = 1,251.25