Finding the Fourth Proportional to 1,665.62, 2,298.57 and 919.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.62 : 2,298.57 = 919.63 : x
2. Step 2: Convert to fraction form
   1,665.62/2,298.57 = 919.63/x
3. Step 3: Cross multiply
   1,665.62x = 2,298.57 × 919.63
4. Step 4: Simplify right side
   1,665.62x = 2,113,825.60
5. Step 5: Solve for x
   x = 2,113,825.60/1,665.62
6. Step 6: Final answer
   x = 1,269.09