Finding the Fourth Proportional to 1,665.21, 2,297.87 and 919.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.21 : 2,297.87 = 919.05 : x
2. Step 2: Convert to fraction form
   1,665.21/2,297.87 = 919.05/x
3. Step 3: Cross multiply
   1,665.21x = 2,297.87 × 919.05
4. Step 4: Simplify right side
   1,665.21x = 2,111,847.66
5. Step 5: Solve for x
   x = 2,111,847.66/1,665.21
6. Step 6: Final answer
   x = 1,268.22