Finding the Fourth Proportional to 1,061.33, 1,464.81 and 641.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.33 : 1,464.81 = 641.74 : x
2. Step 2: Convert to fraction form
   1,061.33/1,464.81 = 641.74/x
3. Step 3: Cross multiply
   1,061.33x = 1,464.81 × 641.74
4. Step 4: Simplify right side
   1,061.33x = 940,027.17
5. Step 5: Solve for x
   x = 940,027.17/1,061.33
6. Step 6: Final answer
   x = 885.71