Finding the Fourth Proportional to 1,658.52, 2,287.86 and 1,215.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,658.52 : 2,287.86 = 1,215.42 : x
2. Step 2: Convert to fraction form
   1,658.52/2,287.86 = 1,215.42/x
3. Step 3: Cross multiply
   1,658.52x = 2,287.86 × 1,215.42
4. Step 4: Simplify right side
   1,658.52x = 2,780,710.80
5. Step 5: Solve for x
   x = 2,780,710.80/1,658.52
6. Step 6: Final answer
   x = 1,676.62