Finding the Fourth Proportional to 1,381.02, 2,081.94 and 1,287.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.02 : 2,081.94 = 1,287.06 : x
2. Step 2: Convert to fraction form
   1,381.02/2,081.94 = 1,287.06/x
3. Step 3: Cross multiply
   1,381.02x = 2,081.94 × 1,287.06
4. Step 4: Simplify right side
   1,381.02x = 2,679,581.70
5. Step 5: Solve for x
   x = 2,679,581.70/1,381.02
6. Step 6: Final answer
   x = 1,940.29