Finding the Fourth Proportional to 1,234.56, 1,849.40 and 648.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,234.56 : 1,849.40 = 648.69 : x
2. Step 2: Convert to fraction form
   1,234.56/1,849.40 = 648.69/x
3. Step 3: Cross multiply
   1,234.56x = 1,849.40 × 648.69
4. Step 4: Simplify right side
   1,234.56x = 1,199,687.29
5. Step 5: Solve for x
   x = 1,199,687.29/1,234.56
6. Step 6: Final answer
   x = 971.75