Finding the Fourth Proportional to 1,228.72, 1,842.54 and 498.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,228.72 : 1,842.54 = 498.28 : x
2. Step 2: Convert to fraction form
   1,228.72/1,842.54 = 498.28/x
3. Step 3: Cross multiply
   1,228.72x = 1,842.54 × 498.28
4. Step 4: Simplify right side
   1,228.72x = 918,100.83
5. Step 5: Solve for x
   x = 918,100.83/1,228.72
6. Step 6: Final answer
   x = 747.20