Finding the Fourth Proportional to 1,381.65, 1,904.49 and 1,086.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.65 : 1,904.49 = 1,086.41 : x
2. Step 2: Convert to fraction form
   1,381.65/1,904.49 = 1,086.41/x
3. Step 3: Cross multiply
   1,381.65x = 1,904.49 × 1,086.41
4. Step 4: Simplify right side
   1,381.65x = 2,069,056.98
5. Step 5: Solve for x
   x = 2,069,056.98/1,381.65
6. Step 6: Final answer
   x = 1,497.53