Finding the Fourth Proportional to 1,665.19, 2,297.85 and 919.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.19 : 2,297.85 = 919.15 : x
2. Step 2: Convert to fraction form
   1,665.19/2,297.85 = 919.15/x
3. Step 3: Cross multiply
   1,665.19x = 2,297.85 × 919.15
4. Step 4: Simplify right side
   1,665.19x = 2,112,068.83
5. Step 5: Solve for x
   x = 2,112,068.83/1,665.19
6. Step 6: Final answer
   x = 1,268.37