Finding the Fourth Proportional to 1,658.39, 2,288.59 and 912.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,658.39 : 2,288.59 = 912.42 : x
2. Step 2: Convert to fraction form
   1,658.39/2,288.59 = 912.42/x
3. Step 3: Cross multiply
   1,658.39x = 2,288.59 × 912.42
4. Step 4: Simplify right side
   1,658.39x = 2,088,153.01
5. Step 5: Solve for x
   x = 2,088,153.01/1,658.39
6. Step 6: Final answer
   x = 1,259.15