Finding the Fourth Proportional to 1,423.98, 2,131.92 and 935.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,423.98 : 2,131.92 = 935.55 : x
2. Step 2: Convert to fraction form
   1,423.98/2,131.92 = 935.55/x
3. Step 3: Cross multiply
   1,423.98x = 2,131.92 × 935.55
4. Step 4: Simplify right side
   1,423.98x = 1,994,517.76
5. Step 5: Solve for x
   x = 1,994,517.76/1,423.98
6. Step 6: Final answer
   x = 1,400.66