Finding the Fourth Proportional to 1,585.06, 2,187.83 and 921.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,585.06 : 2,187.83 = 921.79 : x
2. Step 2: Convert to fraction form
   1,585.06/2,187.83 = 921.79/x
3. Step 3: Cross multiply
   1,585.06x = 2,187.83 × 921.79
4. Step 4: Simplify right side
   1,585.06x = 2,016,719.82
5. Step 5: Solve for x
   x = 2,016,719.82/1,585.06
6. Step 6: Final answer
   x = 1,272.33