Finding the Fourth Proportional to 1,421.84, 1,962.60 and 956.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.84 : 1,962.60 = 956.72 : x
2. Step 2: Convert to fraction form
   1,421.84/1,962.60 = 956.72/x
3. Step 3: Cross multiply
   1,421.84x = 1,962.60 × 956.72
4. Step 4: Simplify right side
   1,421.84x = 1,877,658.67
5. Step 5: Solve for x
   x = 1,877,658.67/1,421.84
6. Step 6: Final answer
   x = 1,320.58