Finding the Fourth Proportional to 1,061.54, 1,464.68 and 641.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.54 : 1,464.68 = 641.56 : x
2. Step 2: Convert to fraction form
   1,061.54/1,464.68 = 641.56/x
3. Step 3: Cross multiply
   1,061.54x = 1,464.68 × 641.56
4. Step 4: Simplify right side
   1,061.54x = 939,680.10
5. Step 5: Solve for x
   x = 939,680.10/1,061.54
6. Step 6: Final answer
   x = 885.20