Finding the Fourth Proportional to 1,061.55, 1,465.02 and 641.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.55 : 1,465.02 = 641.92 : x
2. Step 2: Convert to fraction form
   1,061.55/1,465.02 = 641.92/x
3. Step 3: Cross multiply
   1,061.55x = 1,465.02 × 641.92
4. Step 4: Simplify right side
   1,061.55x = 940,425.64
5. Step 5: Solve for x
   x = 940,425.64/1,061.55
6. Step 6: Final answer
   x = 885.90