Finding the Fourth Proportional to 3,421.53, 5,131.35 and 956.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,421.53 : 5,131.35 = 956.61 : x
2. Step 2: Convert to fraction form
   3,421.53/5,131.35 = 956.61/x
3. Step 3: Cross multiply
   3,421.53x = 5,131.35 × 956.61
4. Step 4: Simplify right side
   3,421.53x = 4,908,700.72
5. Step 5: Solve for x
   x = 4,908,700.72/3,421.53
6. Step 6: Final answer
   x = 1,434.65