Finding the Fourth Proportional to 1,648.12, 2,469.45 and 1,158.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,648.12 : 2,469.45 = 1,158.78 : x
2. Step 2: Convert to fraction form
   1,648.12/2,469.45 = 1,158.78/x
3. Step 3: Cross multiply
   1,648.12x = 2,469.45 × 1,158.78
4. Step 4: Simplify right side
   1,648.12x = 2,861,549.27
5. Step 5: Solve for x
   x = 2,861,549.27/1,648.12
6. Step 6: Final answer
   x = 1,736.25