Finding the Fourth Proportional to 1,061.07, 1,464.28 and 641.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.07 : 1,464.28 = 641.42 : x
2. Step 2: Convert to fraction form
   1,061.07/1,464.28 = 641.42/x
3. Step 3: Cross multiply
   1,061.07x = 1,464.28 × 641.42
4. Step 4: Simplify right side
   1,061.07x = 939,215.04
5. Step 5: Solve for x
   x = 939,215.04/1,061.07
6. Step 6: Final answer
   x = 885.16