Finding the Fourth Proportional to 1,061.22, 1,464.50 and 641.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.22 : 1,464.50 = 641.57 : x
2. Step 2: Convert to fraction form
   1,061.22/1,464.50 = 641.57/x
3. Step 3: Cross multiply
   1,061.22x = 1,464.50 × 641.57
4. Step 4: Simplify right side
   1,061.22x = 939,579.27
5. Step 5: Solve for x
   x = 939,579.27/1,061.22
6. Step 6: Final answer
   x = 885.38