Finding the Fourth Proportional to 1,436.87, 1,992.96 and 1,378.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.87 : 1,992.96 = 1,378.55 : x
2. Step 2: Convert to fraction form
   1,436.87/1,992.96 = 1,378.55/x
3. Step 3: Cross multiply
   1,436.87x = 1,992.96 × 1,378.55
4. Step 4: Simplify right side
   1,436.87x = 2,747,395.01
5. Step 5: Solve for x
   x = 2,747,395.01/1,436.87
6. Step 6: Final answer
   x = 1,912.07