Finding the Fourth Proportional to 1,640.06, 2,262.74 and 931.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,640.06 : 2,262.74 = 931.82 : x
2. Step 2: Convert to fraction form
   1,640.06/2,262.74 = 931.82/x
3. Step 3: Cross multiply
   1,640.06x = 2,262.74 × 931.82
4. Step 4: Simplify right side
   1,640.06x = 2,108,466.39
5. Step 5: Solve for x
   x = 2,108,466.39/1,640.06
6. Step 6: Final answer
   x = 1,285.60