Finding the Fourth Proportional to 1,061.39, 1,464.93 and 641.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.39 : 1,464.93 = 641.91 : x
2. Step 2: Convert to fraction form
   1,061.39/1,464.93 = 641.91/x
3. Step 3: Cross multiply
   1,061.39x = 1,464.93 × 641.91
4. Step 4: Simplify right side
   1,061.39x = 940,353.22
5. Step 5: Solve for x
   x = 940,353.22/1,061.39
6. Step 6: Final answer
   x = 885.97