Finding the Fourth Proportional to 1,377.80, 1,901.90 and 935.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.80 : 1,901.90 = 935.96 : x
2. Step 2: Convert to fraction form
   1,377.80/1,901.90 = 935.96/x
3. Step 3: Cross multiply
   1,377.80x = 1,901.90 × 935.96
4. Step 4: Simplify right side
   1,377.80x = 1,780,095.15
5. Step 5: Solve for x
   x = 1,780,095.15/1,377.80
6. Step 6: Final answer
   x = 1,291.98