Finding the Fourth Proportional to 1,681.89, 2,321.01 and 935.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,681.89 : 2,321.01 = 935.85 : x
2. Step 2: Convert to fraction form
   1,681.89/2,321.01 = 935.85/x
3. Step 3: Cross multiply
   1,681.89x = 2,321.01 × 935.85
4. Step 4: Simplify right side
   1,681.89x = 2,172,117.21
5. Step 5: Solve for x
   x = 2,172,117.21/1,681.89
6. Step 6: Final answer
   x = 1,291.47