Finding the Fourth Proportional to 1,061.10, 1,464.28 and 641.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.10 : 1,464.28 = 641.48 : x
2. Step 2: Convert to fraction form
   1,061.10/1,464.28 = 641.48/x
3. Step 3: Cross multiply
   1,061.10x = 1,464.28 × 641.48
4. Step 4: Simplify right side
   1,061.10x = 939,297.41
5. Step 5: Solve for x
   x = 939,297.41/1,061.10
6. Step 6: Final answer
   x = 885.21