Finding the Fourth Proportional to 1,665.62, 2,298.38 and 919.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.62 : 2,298.38 = 919.56 : x
2. Step 2: Convert to fraction form
   1,665.62/2,298.38 = 919.56/x
3. Step 3: Cross multiply
   1,665.62x = 2,298.38 × 919.56
4. Step 4: Simplify right side
   1,665.62x = 2,113,493.72
5. Step 5: Solve for x
   x = 2,113,493.72/1,665.62
6. Step 6: Final answer
   x = 1,268.90