Finding the Fourth Proportional to 1,010.55, 1,515.32 and 425.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,010.55 : 1,515.32 = 425.37 : x
2. Step 2: Convert to fraction form
   1,010.55/1,515.32 = 425.37/x
3. Step 3: Cross multiply
   1,010.55x = 1,515.32 × 425.37
4. Step 4: Simplify right side
   1,010.55x = 644,561.96
5. Step 5: Solve for x
   x = 644,561.96/1,010.55
6. Step 6: Final answer
   x = 637.84