Finding the Fourth Proportional to 1,681.71, 2,320.72 and 935.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,681.71 : 2,320.72 = 935.63 : x
2. Step 2: Convert to fraction form
   1,681.71/2,320.72 = 935.63/x
3. Step 3: Cross multiply
   1,681.71x = 2,320.72 × 935.63
4. Step 4: Simplify right side
   1,681.71x = 2,171,335.25
5. Step 5: Solve for x
   x = 2,171,335.25/1,681.71
6. Step 6: Final answer
   x = 1,291.15