Finding the Fourth Proportional to 1,010.69, 1,514.94 and 425.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,010.69 : 1,514.94 = 425.55 : x
2. Step 2: Convert to fraction form
   1,010.69/1,514.94 = 425.55/x
3. Step 3: Cross multiply
   1,010.69x = 1,514.94 × 425.55
4. Step 4: Simplify right side
   1,010.69x = 644,682.72
5. Step 5: Solve for x
   x = 644,682.72/1,010.69
6. Step 6: Final answer
   x = 637.86