Finding the Fourth Proportional to 1,377.89, 1,898.93 and 935.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.89 : 1,898.93 = 935.81 : x
2. Step 2: Convert to fraction form
   1,377.89/1,898.93 = 935.81/x
3. Step 3: Cross multiply
   1,377.89x = 1,898.93 × 935.81
4. Step 4: Simplify right side
   1,377.89x = 1,777,033.00
5. Step 5: Solve for x
   x = 1,777,033.00/1,377.89
6. Step 6: Final answer
   x = 1,289.68