Finding the Fourth Proportional to 1,914.67, 2,639.59 and 1,284.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,914.67 : 2,639.59 = 1,284.09 : x
2. Step 2: Convert to fraction form
   1,914.67/2,639.59 = 1,284.09/x
3. Step 3: Cross multiply
   1,914.67x = 2,639.59 × 1,284.09
4. Step 4: Simplify right side
   1,914.67x = 3,389,471.12
5. Step 5: Solve for x
   x = 3,389,471.12/1,914.67
6. Step 6: Final answer
   x = 1,770.26