Finding the Fourth Proportional to 1,665.57, 2,298.60 and 919.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.57 : 2,298.60 = 919.59 : x
2. Step 2: Convert to fraction form
   1,665.57/2,298.60 = 919.59/x
3. Step 3: Cross multiply
   1,665.57x = 2,298.60 × 919.59
4. Step 4: Simplify right side
   1,665.57x = 2,113,769.57
5. Step 5: Solve for x
   x = 2,113,769.57/1,665.57
6. Step 6: Final answer
   x = 1,269.10