Finding the Fourth Proportional to 1,155.51, 1,732.18 and 424.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.51 : 1,732.18 = 424.89 : x
2. Step 2: Convert to fraction form
   1,155.51/1,732.18 = 424.89/x
3. Step 3: Cross multiply
   1,155.51x = 1,732.18 × 424.89
4. Step 4: Simplify right side
   1,155.51x = 735,985.96
5. Step 5: Solve for x
   x = 735,985.96/1,155.51
6. Step 6: Final answer
   x = 636.94