Finding the Fourth Proportional to 1,061.25, 1,464.18 and 641.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.25 : 1,464.18 = 641.73 : x
2. Step 2: Convert to fraction form
   1,061.25/1,464.18 = 641.73/x
3. Step 3: Cross multiply
   1,061.25x = 1,464.18 × 641.73
4. Step 4: Simplify right side
   1,061.25x = 939,608.23
5. Step 5: Solve for x
   x = 939,608.23/1,061.25
6. Step 6: Final answer
   x = 885.38