Finding the Fourth Proportional to 1,665.89, 2,298.70 and 919.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.89 : 2,298.70 = 919.88 : x
2. Step 2: Convert to fraction form
   1,665.89/2,298.70 = 919.88/x
3. Step 3: Cross multiply
   1,665.89x = 2,298.70 × 919.88
4. Step 4: Simplify right side
   1,665.89x = 2,114,528.16
5. Step 5: Solve for x
   x = 2,114,528.16/1,665.89
6. Step 6: Final answer
   x = 1,269.31