Finding the Fourth Proportional to 1,061.66, 1,464.92 and 641.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.66 : 1,464.92 = 641.94 : x
2. Step 2: Convert to fraction form
   1,061.66/1,464.92 = 641.94/x
3. Step 3: Cross multiply
   1,061.66x = 1,464.92 × 641.94
4. Step 4: Simplify right side
   1,061.66x = 940,390.74
5. Step 5: Solve for x
   x = 940,390.74/1,061.66
6. Step 6: Final answer
   x = 885.77