Finding the Fourth Proportional to 1,401.87, 1,931.52 and 935.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.87 : 1,931.52 = 935.31 : x
2. Step 2: Convert to fraction form
   1,401.87/1,931.52 = 935.31/x
3. Step 3: Cross multiply
   1,401.87x = 1,931.52 × 935.31
4. Step 4: Simplify right side
   1,401.87x = 1,806,569.97
5. Step 5: Solve for x
   x = 1,806,569.97/1,401.87
6. Step 6: Final answer
   x = 1,288.69