Finding the Fourth Proportional to 1,400.45, 2,090.49 and 1,284.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,400.45 : 2,090.49 = 1,284.89 : x
2. Step 2: Convert to fraction form
   1,400.45/2,090.49 = 1,284.89/x
3. Step 3: Cross multiply
   1,400.45x = 2,090.49 × 1,284.89
4. Step 4: Simplify right side
   1,400.45x = 2,686,034.43
5. Step 5: Solve for x
   x = 2,686,034.43/1,400.45
6. Step 6: Final answer
   x = 1,917.99